diff --git a/src/gui_gtk_f.c b/src/gui_gtk_f.c
index d88499e..ccf54ec 100644
--- a/src/gui_gtk_f.c
+++ b/src/gui_gtk_f.c
@@ -860,11 +860,9 @@
 gtk_form_set_static_gravity(GdkWindow *window, gboolean use_static)
 {
 #ifdef HAVE_GTK2
-    gboolean static_gravity_supported;
-
-    static_gravity_supported = gdk_window_set_static_gravities(window,
-							       use_static);
-    g_return_if_fail(static_gravity_supported);
+    /* We don't check if static gravity is actually supported, because it
+     * results in an annoying assertion error message. */
+    gdk_window_set_static_gravities(window, use_static);
 #else
     XSetWindowAttributes xattributes;