diff --git a/src/gtk/dialog.cpp b/src/gtk/dialog.cpp
index c30d349e3f..b57b9b4992 100644
--- a/src/gtk/dialog.cpp
+++ b/src/gtk/dialog.cpp
@@ -136,9 +136,7 @@ int wxDialog::ShowModal()
     // release the mouse if it's currently captured as the window having it
     // will be disabled when this dialog is shown -- but will still keep the
     // capture making it impossible to do anything in the modal dialog itself
-    wxWindow * const win = wxWindow::GetCapture();
-    if ( win )
-        win->GTKReleaseMouseAndNotify();
+    GTKReleaseMouseAndNotify();
 
     wxWindow * const parent = GetParentForModalDialog();
     if ( parent )
diff --git a/src/gtk/msgdlg.cpp b/src/gtk/msgdlg.cpp
index 86a7b786cc..9ff33058f7 100644
--- a/src/gtk/msgdlg.cpp
+++ b/src/gtk/msgdlg.cpp
@@ -277,12 +277,6 @@ int wxMessageDialog::ShowModal()
 {
     WX_HOOK_MODAL_DIALOG();
 
-    // break the mouse capture as it would interfere with modal dialog (see
-    // wxDialog::ShowModal)
-    wxWindow * const win = wxWindow::GetCapture();
-    if ( win )
-        win->GTKReleaseMouseAndNotify();
-
     if ( !m_widget )
     {
         GTKCreateMsgDialog();
@@ -290,6 +284,10 @@ int wxMessageDialog::ShowModal()
                      wxT("failed to create GtkMessageDialog") );
     }
 
+    // break the mouse capture as it would interfere with modal dialog (see
+    // wxDialog::ShowModal)
+    GTKReleaseMouseAndNotify();
+
     // This should be necessary, but otherwise the
     // parent TLW will disappear..
     if (m_parent)
diff --git a/src/gtk/utilsgtk.cpp b/src/gtk/utilsgtk.cpp
index 87db2b1598..e299cdc58a 100644
--- a/src/gtk/utilsgtk.cpp
+++ b/src/gtk/utilsgtk.cpp
@@ -295,6 +295,15 @@ bool wxGUIAppTraits::ShowAssertDialog(const wxString& msg)
         GtkWidget *dialog = gtk_assert_dialog_new();
         gtk_assert_dialog_set_message(GTK_ASSERT_DIALOG(dialog), msg.mb_str());
 
+        GdkDisplay* display = gtk_widget_get_display(dialog);
+#ifdef __WXGTK3__
+        GdkDeviceManager* manager = gdk_display_get_device_manager(display);
+        GdkDevice* device = gdk_device_manager_get_client_pointer(manager);
+        gdk_device_ungrab(device, unsigned(GDK_CURRENT_TIME));
+#else
+        gdk_display_pointer_ungrab(display, unsigned(GDK_CURRENT_TIME));
+#endif
+
 #if wxUSE_STACKWALKER
         // save the current stack ow...
         StackDump dump(GTK_ASSERT_DIALOG(dialog));
diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 69d2ded460..7f6584af6a 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -4840,10 +4840,16 @@ void wxWindowGTK::DoReleaseMouse()
 
 void wxWindowGTK::GTKReleaseMouseAndNotify()
 {
-    ReleaseMouse();
-    wxMouseCaptureLostEvent evt(GetId());
-    evt.SetEventObject( this );
-    HandleWindowEvent( evt );
+    GdkDisplay* display = gtk_widget_get_display(m_widget);
+#ifdef __WXGTK3__
+    GdkDeviceManager* manager = gdk_display_get_device_manager(display);
+    GdkDevice* device = gdk_device_manager_get_client_pointer(manager);
+    gdk_device_ungrab(device, unsigned(GDK_CURRENT_TIME));
+#else
+    gdk_display_pointer_ungrab(display, unsigned(GDK_CURRENT_TIME));
+#endif
+    g_captureWindow = NULL;
+    NotifyCaptureLost();
 }
 
 /* static */