diff --git a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java
index 809ccb1..a894399 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/OS.java
@@ -4255,7 +4255,6 @@
  */
 public static final void setDarkThemePreferred(boolean preferred){
 	if (!GTK.GTK3) return; //only applicable to GTK3
-	GDK.gdk_flush();
 	g_object_set(GTK.gtk_settings_get_default(), GTK.gtk_application_prefer_dark_theme,
 			preferred, 0);
 	g_object_notify(GTK.gtk_settings_get_default(),