diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index b8d9b4e98..946233cd1 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -1177,14 +1177,14 @@ meta_monitor_manager_legacy_handle_apply_configuration  (MetaDBusDisplayConfig *
 #define META_DISPLAY_CONFIG_MODE_FLAGS_PREFERRED (1 << 0)
 #define META_DISPLAY_CONFIG_MODE_FLAGS_CURRENT (1 << 1)
 
-#define MODE_FORMAT "(iidiu)"
+#define MODE_FORMAT "(iiddu)"
 #define MODES_FORMAT "a" MODE_FORMAT
 #define MONITOR_SPEC_FORMAT "(ssss)"
 #define MONITOR_FORMAT "(" MONITOR_SPEC_FORMAT MODES_FORMAT "a{sv})"
 #define MONITORS_FORMAT "a" MONITOR_FORMAT
 
 #define LOGICAL_MONITOR_MONITORS_FORMAT "a" MONITOR_SPEC_FORMAT
-#define LOGICAL_MONITOR_FORMAT "(iiii" LOGICAL_MONITOR_MONITORS_FORMAT "iba{sv})"
+#define LOGICAL_MONITOR_FORMAT "(iiii" LOGICAL_MONITOR_MONITORS_FORMAT "dba{sv})"
 #define LOGICAL_MONITORS_FORMAT "a" LOGICAL_MONITOR_FORMAT
 
 static gboolean
@@ -1237,7 +1237,7 @@ meta_monitor_manager_handle_get_current_state (MetaDBusDisplayConfig *skeleton,
                                  monitor_mode_spec->width,
                                  monitor_mode_spec->height,
                                  monitor_mode_spec->refresh_rate,
-                                 preferred_scale,
+                                 (double) preferred_scale,
                                  flags);
         }
 
@@ -1289,7 +1289,7 @@ meta_monitor_manager_handle_get_current_state (MetaDBusDisplayConfig *skeleton,
                              logical_monitor->rect.width,
                              logical_monitor->rect.height,
                              &logical_monitor_monitors_builder,
-                             logical_monitor->scale,
+                             (double) logical_monitor->scale,
                              logical_monitor->is_primary,
                              NULL);
     }
diff --git a/src/org.gnome.Mutter.DisplayConfig.xml b/src/org.gnome.Mutter.DisplayConfig.xml
index 9efe535de..22cb017f4 100644
--- a/src/org.gnome.Mutter.DisplayConfig.xml
+++ b/src/org.gnome.Mutter.DisplayConfig.xml
@@ -308,7 +308,7 @@
 	    * i width: width in physical pixels
 	    * i height: height in physical pixels
 	    * d refresh rate: refresh rate
-	    * i preferred scale: scale preferred as per calculations
+	    * d preferred scale: scale preferred as per calculations
 	    * u flags: mode flags (see below)
 	* a{sv} properties: optional properties, including:
 	    - "width_mm" (i): physical width of monitor in millimeters
@@ -333,7 +333,7 @@
 	    * vendor: vendor name
 	    * product: product name
 	    * serial: product serial
-	* i scale: scale
+	* d scale: scale
 	* b primary: true if this is the primary logical monitor
 	* a{sv} properties: possibly other properties
 
@@ -343,8 +343,8 @@
     -->
     <method name="GetCurrentState">
       <arg name="serial" direction="out" type="u" />
-      <arg name="monitors" direction="out" type="a((ssss)a(iidiu)a{sv})" />
-      <arg name="logical_monitors" direction="out" type="a(iiiia(ssss)iba{sv})" />
+      <arg name="monitors" direction="out" type="a((ssss)a(iiddu)a{sv})" />
+      <arg name="logical_monitors" direction="out" type="a(iiiia(ssss)dba{sv})" />
       <arg name="max_screen_size" direction="out" type="(ii)" />
     </method>
   </interface>