diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index b6cb329fce..280cd554b2 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -2073,7 +2073,7 @@ parse_selector_pseudo_class (GtkCssScanner  *scanner,
     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
-    { "window-unfocused", 0, GTK_STATE_FLAG_WINDOW_UNFOCUSED },
+    { "backdrop",     0, GTK_STATE_FLAG_BACKDROP },
     { NULL, }
   }, nth_child_classes[] = {
     { "first",        GTK_REGION_FIRST, 0 },
diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index 21f3437040..5851af68fc 100644
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -154,7 +154,7 @@ _gtk_css_selector_print (const GtkCssSelector *selector,
         "insensitive",
         "inconsistent",
         "focus",
-        "window-unfocused"
+        "backdrop"
       };
       guint i;
 
diff --git a/gtk/gtkenums.h b/gtk/gtkenums.h
index 5e4c570e8d..c5efc3fe9a 100644
--- a/gtk/gtkenums.h
+++ b/gtk/gtkenums.h
@@ -842,7 +842,7 @@ typedef enum
  * @GTK_STATE_FLAG_INSENSITIVE: Widget is insensitive.
  * @GTK_STATE_FLAG_INCONSISTENT: Widget is inconsistent.
  * @GTK_STATE_FLAG_FOCUSED: Widget has the keyboard focus.
- * @GTK_STATE_FLAG_WINDOW_UNFOCUSED: Widget's toplevel window is unfocused.
+ * @GTK_STATE_FLAG_BACKDROP: Widget is in a background toplevel window.
  *
  * Describes a widget state.
  */
@@ -855,7 +855,7 @@ typedef enum
   GTK_STATE_FLAG_INSENSITIVE  = 1 << 3,
   GTK_STATE_FLAG_INCONSISTENT = 1 << 4,
   GTK_STATE_FLAG_FOCUSED      = 1 << 5,
-  GTK_STATE_FLAG_WINDOW_UNFOCUSED = 1 << 6
+  GTK_STATE_FLAG_BACKDROP     = 1 << 6
 } GtkStateFlags;
 
 /**
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 033aeb00d0..4d7b3bab09 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -3783,8 +3783,8 @@ gtk_widget_unparent (GtkWidget *widget)
       gtk_widget_queue_compute_expand (old_parent);
     }
 
-  /* Unset window-unfocused since we are no longer inside a toplevel window */
-  gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_WINDOW_UNFOCUSED);
+  /* Unset BACKDROP since we are no longer inside a toplevel window */
+  gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_BACKDROP);
   if (priv->context)
     gtk_style_context_set_parent (priv->context, NULL);
 
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 7cf25f9afe..a9221f26ed 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -478,7 +478,7 @@ static void gtk_window_get_preferred_height   (GtkWidget           *widget,
 					       gint                *minimum_size,
 					       gint                *natural_size);
 
-static void ensure_state_flag_window_unfocused (GtkWidget *widget);
+static void ensure_state_flag_backdrop (GtkWidget *widget);
 
 G_DEFINE_TYPE_WITH_CODE (GtkWindow, gtk_window, GTK_TYPE_BIN,
                          G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
@@ -4893,7 +4893,7 @@ gtk_window_map (GtkWidget *widget)
   else
     gtk_window_set_focus_visible (window, visible_focus == GTK_POLICY_ALWAYS);
 
-  ensure_state_flag_window_unfocused (widget);
+  ensure_state_flag_backdrop (widget);
 }
 
 static gboolean
@@ -5543,7 +5543,7 @@ gtk_window_state_event (GtkWidget           *widget,
   update_grip_visibility (GTK_WINDOW (widget));
 
   if (event->changed_mask & GDK_WINDOW_STATE_FOCUSED)
-    ensure_state_flag_window_unfocused (widget);
+    ensure_state_flag_backdrop (widget);
 
   return FALSE;
 }
@@ -9697,7 +9697,7 @@ gtk_window_set_has_user_ref_count (GtkWindow *window,
 }
 
 static void
-ensure_state_flag_window_unfocused (GtkWidget *widget)
+ensure_state_flag_backdrop (GtkWidget *widget)
 {
   GdkWindow *window;
   gboolean window_focused = TRUE;
@@ -9707,9 +9707,9 @@ ensure_state_flag_window_unfocused (GtkWidget *widget)
   window_focused = gdk_window_get_state (window) & GDK_WINDOW_STATE_FOCUSED;
 
   if (!window_focused)
-    gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_WINDOW_UNFOCUSED, FALSE);
+    gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_BACKDROP, FALSE);
   else
-    gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_WINDOW_UNFOCUSED);
+    gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_BACKDROP);
 
   gtk_widget_queue_draw (widget);
 }