diff --git a/src/core/meta-launch-context.c b/src/core/meta-launch-context.c
index 984338c1b..cccba79f1 100644
--- a/src/core/meta-launch-context.c
+++ b/src/core/meta-launch-context.c
@@ -180,7 +180,7 @@ meta_launch_context_get_startup_notify_id (GAppLaunchContext *launch_context,
                           "application-id", application_id,
                           "name", g_app_info_get_name (info),
                           "workspace", workspace_idx,
-                          "timestamp", context->timestamp,
+                          "timestamp", (uint64_t) context->timestamp,
                           NULL);
 
       meta_startup_notification_add_sequence (sn, seq);
diff --git a/src/wayland/meta-wayland-activation.c b/src/wayland/meta-wayland-activation.c
index db1f2b10d..89f7ca221 100644
--- a/src/wayland/meta-wayland-activation.c
+++ b/src/wayland/meta-wayland-activation.c
@@ -149,7 +149,7 @@ token_commit (struct wl_client   *client,
   MetaXdgActivationToken *token = wl_resource_get_user_data (resource);
   MetaWaylandActivation *activation = token->activation;
   MetaDisplay *display = meta_get_display ();
-  uint32_t timestamp;
+  uint64_t timestamp;
 
   if (token->committed)
     {
diff --git a/src/wayland/meta-wayland-gtk-shell.c b/src/wayland/meta-wayland-gtk-shell.c
index 3d85c3f88..5fd1d80cf 100644
--- a/src/wayland/meta-wayland-gtk-shell.c
+++ b/src/wayland/meta-wayland-gtk-shell.c
@@ -535,7 +535,7 @@ gtk_shell_notify_launch (struct wl_client   *client,
 {
   MetaDisplay *display = meta_get_display ();
   MetaStartupSequence *sequence;
-  uint32_t timestamp;
+  uint64_t timestamp;
 
   sequence = meta_startup_notification_lookup_sequence (display->startup_notification,
                                                         startup_id);