diff --git a/src/gtk/colordlg.cpp b/src/gtk/colordlg.cpp
index 87b61d2d44..b3a806d5b2 100644
--- a/src/gtk/colordlg.cpp
+++ b/src/gtk/colordlg.cpp
@@ -28,6 +28,7 @@
 #include <gtk/gtk.h>
 #include "wx/gtk/private.h"
 #include "wx/gtk/private/gtk2-compat.h"
+#include "wx/gtk/private/dialogcount.h"
 
 #if wxUSE_LIBHILDON
     #include <hildon-widgets/hildon-color-selector.h>
@@ -87,6 +88,8 @@ int wxColourDialog::ShowModal()
 
     ColourDataToDialog();
 
+    wxOpenModalDialogLocker modalLocker;
+
     gint result = gtk_dialog_run(GTK_DIALOG(m_widget));
     gtk_widget_hide(m_widget);
 
diff --git a/src/gtk/msgdlg.cpp b/src/gtk/msgdlg.cpp
index b01e51b13e..2c561dfca3 100644
--- a/src/gtk/msgdlg.cpp
+++ b/src/gtk/msgdlg.cpp
@@ -30,6 +30,7 @@
 #include "wx/gtk/private.h"
 #include "wx/gtk/private/messagetype.h"
 #include "wx/gtk/private/mnemonics.h"
+#include "wx/gtk/private/dialogcount.h"
 
 #if wxUSE_LIBHILDON
     #include <hildon-widgets/hildon-note.h>
@@ -295,6 +296,8 @@ int wxMessageDialog::ShowModal()
     if (m_parent)
         gtk_window_present( GTK_WINDOW(m_parent->m_widget) );
 
+    wxOpenModalDialogLocker modalLocker;
+
     gint result = gtk_dialog_run(GTK_DIALOG(m_widget));
     GTKDisconnect(m_widget);
     gtk_widget_destroy(m_widget);