diff --git a/src/gtk/toplevel.cpp b/src/gtk/toplevel.cpp
index 37d15df568..f300b5ea56 100644
--- a/src/gtk/toplevel.cpp
+++ b/src/gtk/toplevel.cpp
@@ -852,7 +852,7 @@ bool wxTopLevelWindowGTK::ShowFullScreen(bool show, long)
 
     m_fsIsShowing = show;
 
-#ifdef GDK_WINDOWING_X11
+#if defined(GDK_WINDOWING_X11) && !defined(__WXGTK4__)
     GdkScreen* screen = gtk_widget_get_screen(m_widget);
     GdkDisplay* display = gdk_screen_get_display(screen);
     Display* xdpy = NULL;
@@ -878,7 +878,7 @@ bool wxTopLevelWindowGTK::ShowFullScreen(bool show, long)
         else
             gtk_window_unfullscreen( GTK_WINDOW( m_widget ) );
     }
-#ifdef GDK_WINDOWING_X11
+#if defined(GDK_WINDOWING_X11) && !defined(__WXGTK4__)
     else if (xdpy != NULL)
     {
         GdkWindow* window = gtk_widget_get_window(m_widget);
@@ -889,8 +889,10 @@ bool wxTopLevelWindowGTK::ShowFullScreen(bool show, long)
             GetPosition( &m_fsSaveFrame.x, &m_fsSaveFrame.y );
             GetSize( &m_fsSaveFrame.width, &m_fsSaveFrame.height );
 
+            wxGCC_WARNING_SUPPRESS(deprecated-declarations)
             const int screen_width = gdk_screen_get_width(screen);
             const int screen_height = gdk_screen_get_height(screen);
+            wxGCC_WARNING_RESTORE()
 
             gint client_x, client_y, root_x, root_y;
             gint width, height;