diff --git a/src/backends/meta-cursor-sprite-xcursor.c b/src/backends/meta-cursor-sprite-xcursor.c
index 730d32351..c57a5a684 100644
--- a/src/backends/meta-cursor-sprite-xcursor.c
+++ b/src/backends/meta-cursor-sprite-xcursor.c
@@ -199,7 +199,7 @@ load_from_current_xcursor_image (MetaCursorSpriteXcursor *sprite_xcursor)
                                            &error);
   if (!texture)
     {
-      g_warning ("Failed to allocate cursor texture: %s\n", error->message);
+      g_warning ("Failed to allocate cursor texture: %s", error->message);
       g_error_free (error);
     }
 
diff --git a/src/backends/meta-monitor-config-store.c b/src/backends/meta-monitor-config-store.c
index 129b63285..8d116817d 100644
--- a/src/backends/meta-monitor-config-store.c
+++ b/src/backends/meta-monitor-config-store.c
@@ -1333,7 +1333,7 @@ saved_cb (GObject      *object,
     {
       if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
         {
-          g_warning ("Saving monitor configuration failed: %s\n", error->message);
+          g_warning ("Saving monitor configuration failed: %s", error->message);
           g_clear_object (&data->config_store->save_cancellable);
         }
 
@@ -1372,7 +1372,7 @@ meta_monitor_config_store_save_sync (MetaMonitorConfigStore *config_store)
                                 NULL,
                                 &error))
     {
-      g_warning ("Saving monitor configuration failed: %s\n",
+      g_warning ("Saving monitor configuration failed: %s",
                  error->message);
       g_error_free (error);
     }
diff --git a/src/backends/meta-profiler.c b/src/backends/meta-profiler.c
index 43e49aa38..7a18b85ce 100644
--- a/src/backends/meta-profiler.c
+++ b/src/backends/meta-profiler.c
@@ -145,7 +145,7 @@ on_bus_acquired_cb (GObject      *source,
   if (error)
     {
       if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
-        g_warning ("Failed to get session bus: %s\n", error->message);
+        g_warning ("Failed to get session bus: %s", error->message);
       return;
     }
 
@@ -157,7 +157,7 @@ on_bus_acquired_cb (GObject      *source,
                                          META_SYSPROF_PROFILER_DBUS_PATH,
                                          &error))
     {
-      g_warning ("Failed to export profiler object: %s\n", error->message);
+      g_warning ("Failed to export profiler object: %s", error->message);
       return;
     }
 
diff --git a/src/backends/meta-remote-desktop.c b/src/backends/meta-remote-desktop.c
index 95dd95e7e..1b73f4a91 100644
--- a/src/backends/meta-remote-desktop.c
+++ b/src/backends/meta-remote-desktop.c
@@ -207,7 +207,7 @@ on_bus_acquired (GDBusConnection *connection,
                                          connection,
                                          META_REMOTE_DESKTOP_DBUS_PATH,
                                          &error))
-    g_warning ("Failed to export remote desktop object: %s\n", error->message);
+    g_warning ("Failed to export remote desktop object: %s", error->message);
 }
 
 static void
@@ -215,7 +215,7 @@ on_name_acquired (GDBusConnection *connection,
                   const char      *name,
                   gpointer         user_data)
 {
-  g_info ("Acquired name %s\n", name);
+  g_info ("Acquired name %s", name);
 }
 
 static void
@@ -223,7 +223,7 @@ on_name_lost (GDBusConnection *connection,
               const char      *name,
               gpointer         user_data)
 {
-  g_warning ("Lost or failed to acquire name %s\n", name);
+  g_warning ("Lost or failed to acquire name %s", name);
 }
 
 static void
diff --git a/src/backends/meta-screen-cast.c b/src/backends/meta-screen-cast.c
index 87e388163..13809d853 100644
--- a/src/backends/meta-screen-cast.c
+++ b/src/backends/meta-screen-cast.c
@@ -280,7 +280,7 @@ on_bus_acquired (GDBusConnection *connection,
                                          connection,
                                          META_SCREEN_CAST_DBUS_PATH,
                                          &error))
-    g_warning ("Failed to export remote desktop object: %s\n", error->message);
+    g_warning ("Failed to export remote desktop object: %s", error->message);
 }
 
 static void
@@ -288,7 +288,7 @@ on_name_acquired (GDBusConnection *connection,
                   const char      *name,
                   gpointer         user_data)
 {
-  g_info ("Acquired name %s\n", name);
+  g_info ("Acquired name %s", name);
 }
 
 static void
@@ -296,7 +296,7 @@ on_name_lost (GDBusConnection *connection,
               const char      *name,
               gpointer         user_data)
 {
-  g_warning ("Lost or failed to acquire name %s\n", name);
+  g_warning ("Lost or failed to acquire name %s", name);
 }
 
 static void
diff --git a/src/backends/native/meta-backend-native.c b/src/backends/native/meta-backend-native.c
index 81babc248..afd3ff79a 100644
--- a/src/backends/native/meta-backend-native.c
+++ b/src/backends/native/meta-backend-native.c
@@ -816,7 +816,7 @@ meta_activate_session (void)
 
   if (!meta_launcher_activate_session (native->launcher, &error))
     {
-      g_warning ("Could not activate session: %s\n", error->message);
+      g_warning ("Could not activate session: %s", error->message);
       g_error_free (error);
       return FALSE;
     }
diff --git a/src/backends/native/meta-virtual-input-device-native.c b/src/backends/native/meta-virtual-input-device-native.c
index ea0882ca1..510414bde 100644
--- a/src/backends/native/meta-virtual-input-device-native.c
+++ b/src/backends/native/meta-virtual-input-device-native.c
@@ -276,7 +276,7 @@ meta_virtual_input_device_native_notify_key (ClutterVirtualInputDevice *virtual_
 
   if (get_button_type (key) != EVDEV_BUTTON_TYPE_KEY)
     {
-      g_warning ("Unknown/invalid virtual device key 0x%x pressed\n", key);
+      g_warning ("Unknown/invalid virtual device key 0x%x pressed", key);
       return;
     }
 
@@ -373,7 +373,7 @@ apply_level_modifiers (ClutterVirtualInputDevice *virtual_device,
     }
   else
     {
-      g_warning ("Unhandled level: %d\n", level);
+      g_warning ("Unhandled level: %d", level);
       return;
     }
 
@@ -425,7 +425,7 @@ meta_virtual_input_device_native_notify_keyval (ClutterVirtualInputDevice *virtu
 
   if (get_button_type (evcode) != EVDEV_BUTTON_TYPE_KEY)
     {
-      g_warning ("Unknown/invalid virtual device key 0x%x pressed\n", evcode);
+      g_warning ("Unknown/invalid virtual device key 0x%x pressed", evcode);
       return;
     }
 
diff --git a/src/backends/x11/meta-input-settings-x11.c b/src/backends/x11/meta-input-settings-x11.c
index 5c22dffee..d9870bab0 100644
--- a/src/backends/x11/meta-input-settings-x11.c
+++ b/src/backends/x11/meta-input-settings-x11.c
@@ -191,7 +191,7 @@ meta_input_settings_x11_set_send_events (MetaInputSettings        *settings,
     }
 
   if ((values[0] && !available[0]) || (values[1] && !available[1]))
-    g_warning ("Device '%s' does not support sendevents mode %d\n",
+    g_warning ("Device '%s' does not support sendevents mode %d",
                clutter_input_device_get_device_name (device), mode);
   else
     change_property (device, "libinput Send Events Mode Enabled",
@@ -419,7 +419,7 @@ meta_input_settings_x11_set_click_method (MetaInputSettings           *settings,
   }
 
   if ((values[0] && !available[0]) || (values[1] && !available[1]))
-    g_warning ("Device '%s' does not support click method %d\n",
+    g_warning ("Device '%s' does not support click method %d",
                clutter_input_device_get_device_name (device), mode);
   else
     change_property (device, "libinput Click Method Enabled",
diff --git a/src/compositor/meta-surface-actor-x11.c b/src/compositor/meta-surface-actor-x11.c
index 3e1a5a723..41ae2dffb 100644
--- a/src/compositor/meta-surface-actor-x11.c
+++ b/src/compositor/meta-surface-actor-x11.c
@@ -132,7 +132,7 @@ set_pixmap (MetaSurfaceActorX11 *self,
       g_error_free (error);
     }
   else if (G_UNLIKELY (!cogl_texture_pixmap_x11_is_using_tfp_extension (COGL_TEXTURE_PIXMAP_X11 (texture))))
-    g_warning ("NOTE: Not using GLX TFP!\n");
+    g_warning ("NOTE: Not using GLX TFP!");
 
   self->texture = texture;
   meta_shaped_texture_set_texture (stex, texture);
diff --git a/src/core/boxes.c b/src/core/boxes.c
index 37d04bb1a..ac8f2a9fe 100644
--- a/src/core/boxes.c
+++ b/src/core/boxes.c
@@ -435,7 +435,7 @@ merge_spanning_rects_in_region (GList *region)
   if (region == NULL)
     {
       g_warning ("Region to merge was empty!  Either you have a some "
-                 "pathological STRUT list or there's a bug somewhere!\n");
+                 "pathological STRUT list or there's a bug somewhere!");
       return NULL;
     }
 
@@ -955,7 +955,7 @@ meta_rectangle_clamp_to_fit_into_region (const GList         *spanning_rects,
   /* Clamp rect appropriately */
   if (best_rect == NULL)
     {
-      g_warning ("No rect whose size to clamp to found!\n");
+      g_warning ("No rect whose size to clamp to found!");
 
       /* If it doesn't fit, at least make it no bigger than it has to be */
       if (!(fixed_directions & FIXED_DIRECTION_X))
@@ -1019,7 +1019,7 @@ meta_rectangle_clip_to_region (const GList         *spanning_rects,
   /* Clip rect appropriately */
   if (best_rect == NULL)
     {
-      g_warning ("No rect to clip to found!\n");
+      g_warning ("No rect to clip to found!");
     }
   else
     {
@@ -1117,7 +1117,7 @@ meta_rectangle_shove_into_region (const GList         *spanning_rects,
   /* Shove rect appropriately */
   if (best_rect == NULL)
     {
-      g_warning ("No rect to shove into found!\n");
+      g_warning ("No rect to shove into found!");
     }
   else
     {
@@ -1439,7 +1439,7 @@ meta_rectangle_edge_cmp_ignore_type (gconstpointer a, gconstpointer b)
         }
     }
   else
-    g_assert ("Some idiot wanted to sort sides of different types.\n");
+    g_assert ("Some idiot wanted to sort sides of different types.");
 
   return a_compare - b_compare; /* positive value denotes a > b ... */
 }
diff --git a/src/core/constraints.c b/src/core/constraints.c
index 9f4f9120d..b19ecd6cf 100644
--- a/src/core/constraints.c
+++ b/src/core/constraints.c
@@ -371,7 +371,7 @@ setup_constraint_info (ConstraintInfo      *info,
     info->action_type = ACTION_MOVE;
   else
     g_error ("BAD, BAD developer!  No treat for you!  (Fix your calls to "
-             "meta_window_move_resize_internal()).\n");
+             "meta_window_move_resize_internal()).");
 
   info->is_user_action = (flags & META_MOVE_RESIZE_USER_ACTION);
 
diff --git a/src/core/stack.c b/src/core/stack.c
index 116a7312b..44dce7098 100644
--- a/src/core/stack.c
+++ b/src/core/stack.c
@@ -97,7 +97,7 @@ on_stack_changed (MetaStack *stack)
       if (w->unmanaging)
         continue;
 
-      meta_topic (META_DEBUG_STACK, "%u:%d - %s ",
+      meta_topic (META_DEBUG_STACK, "  %u:%d - %s ",
 		  w->layer, w->stack_position, w->desc);
 
       if (w->frame)
diff --git a/src/wayland/meta-xwayland-dnd.c b/src/wayland/meta-xwayland-dnd.c
index cd0f0d3ea..60f416821 100644
--- a/src/wayland/meta-xwayland-dnd.c
+++ b/src/wayland/meta-xwayland-dnd.c
@@ -362,7 +362,7 @@ transfer_cb (MetaSelection *selection,
 
   if (!meta_selection_transfer_finish (selection, res, &error))
     {
-      g_warning ("Could not transfer DnD selection: %s\n", error->message);
+      g_warning ("Could not transfer DnD selection: %s", error->message);
       g_error_free (error);
     }
 
diff --git a/src/wayland/meta-xwayland.c b/src/wayland/meta-xwayland.c
index f2d193e95..88a04e5a2 100644
--- a/src/wayland/meta-xwayland.c
+++ b/src/wayland/meta-xwayland.c
@@ -255,7 +255,7 @@ bind_to_unix_socket (int display)
   unlink (addr.sun_path);
   if (bind (fd, (struct sockaddr *) &addr, size) < 0)
     {
-      g_warning ("failed to bind to %s: %m\n", addr.sun_path);
+      g_warning ("failed to bind to %s: %m", addr.sun_path);
       close (fd);
       return -1;
     }
@@ -501,7 +501,7 @@ on_init_x11_cb (MetaDisplay  *display,
   g_autoptr (GError) error = NULL;
 
   if (!meta_display_init_x11_finish (display, result, &error))
-    g_warning ("Failed to initialize X11 display: %s\n", error->message);
+    g_warning ("Failed to initialize X11 display: %s", error->message);
 }
 
 static gboolean
diff --git a/src/x11/group-props.c b/src/x11/group-props.c
index 77ff1df73..24ee4992c 100644
--- a/src/x11/group-props.c
+++ b/src/x11/group-props.c
@@ -199,7 +199,7 @@ meta_x11_display_init_group_prop_hooks (MetaX11Display *x11_display)
 
   if (i != N_HOOKS)
     {
-      g_error ("Initialized %d group hooks should have been %d\n", i, N_HOOKS);
+      g_error ("Initialized %d group hooks should have been %d", i, N_HOOKS);
     }
 }
 
diff --git a/src/x11/meta-x11-selection.c b/src/x11/meta-x11-selection.c
index f9b3607a7..e389f22c7 100644
--- a/src/x11/meta-x11-selection.c
+++ b/src/x11/meta-x11-selection.c
@@ -156,7 +156,7 @@ write_mimetypes_cb (GOutputStream *stream,
 
   if (error)
     {
-      g_warning ("Could not fetch selection mimetypes: %s\n", error->message);
+      g_warning ("Could not fetch selection mimetypes: %s", error->message);
       g_error_free (error);
     }
 }