diff --git a/gtk/gtkimcontextsimple.c b/gtk/gtkimcontextsimple.c
index a7ac95e47c..a788426ceb 100644
--- a/gtk/gtkimcontextsimple.c
+++ b/gtk/gtkimcontextsimple.c
@@ -686,6 +686,7 @@ gtk_im_context_simple_filter_keypress (GtkIMContext *context,
   GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
   GtkIMContextSimplePrivate *priv = context_simple->priv;
   GdkDisplay *display = gdk_window_get_display (event->window);
+  GdkKeymap *keymap = gdk_keymap_get_for_display (display);
   GSList *tmp_list;
   int n_compose = 0;
   GdkModifierType hex_mod_mask;
@@ -787,11 +788,28 @@ gtk_im_context_simple_filter_keypress (GtkIMContext *context,
        !is_hex_start && !is_hex_end && !is_escape && !is_backspace))
     {
       GdkModifierType no_text_input_mask;
+      GdkModifierType consumed_modifiers = 0;
 
       no_text_input_mask =
-        gdk_keymap_get_modifier_mask (gdk_keymap_get_for_display (display),
+        gdk_keymap_get_modifier_mask (keymap,
                                       GDK_MODIFIER_INTENT_NO_TEXT_INPUT);
 
+#ifdef G_OS_WIN32
+     /* On Win32, even Ctrl + Alt could be text input because AltGr = Ctrl
+      * + Alt. For example, Ctrl + Alt + e = € on a German keyboard. The
+      * GdkEvent's state, however, reports *all* modifiers that were
+      * active at the time the key was pressed, including the ones that
+      * were consumed to generate the keyval. So we cannot just assume
+      * that any key event containing Ctrl or Alt is a keybinding. We have
+      * to first check if those modifiers were actually used to generate
+      * the keyval. If so, then the keypress is regular input and we
+      * should not exit here.
+      */
+      gdk_keymap_translate_keyboard_state (keymap, event->hardware_keycode,
+                                           event->state, event->group, NULL,
+                                           NULL, NULL, &consumed_modifiers);
+#endif
+
       if (priv->in_hex_sequence && priv->modifiers_dropped &&
 	  (event->keyval == GDK_KEY_Return ||
 	   event->keyval == GDK_KEY_ISO_Enter ||
@@ -800,7 +818,7 @@ gtk_im_context_simple_filter_keypress (GtkIMContext *context,
 	  return FALSE;
 	}
 
-      if (event->state & no_text_input_mask)
+      if (event->state & no_text_input_mask & ~consumed_modifiers)
         {
           if (priv->in_hex_sequence || priv->in_compose_sequence)
             return TRUE; /* Don't leak random key events during preedit */