diff --git a/include/wx/gtk/private/event.h b/include/wx/gtk/private/event.h
index c91332eed8..ac3a3eaf8a 100644
--- a/include/wx/gtk/private/event.h
+++ b/include/wx/gtk/private/event.h
@@ -94,6 +94,17 @@ template<typename T> void InitMouseEvent(wxWindowGTK *win,
 // contain the mouse pointer.
 bool SetWindowUnderMouse(wxWindowGTK* win);
 
+// Implementation of enter/leave window callbacks.
+gboolean
+WindowEnterCallback(GtkWidget* widget,
+                    GdkEventCrossing* event,
+                    wxWindowGTK* win);
+
+gboolean
+WindowLeaveCallback(GtkWidget* widget,
+                    GdkEventCrossing* event,
+                    wxWindowGTK* win);
+
 } // namespace wxGTKImpl
 
 #endif // _GTK_PRIVATE_EVENT_H_
diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index b05eda48eb..0f9e4233df 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -2246,14 +2246,16 @@ wx_window_focus_callback(GtkWidget *widget,
     return FALSE;
 }
 
+} // extern "C"
+
 //-----------------------------------------------------------------------------
 // "enter_notify_event"
 //-----------------------------------------------------------------------------
 
-static gboolean
-gtk_window_enter_callback( GtkWidget* widget,
-                           GdkEventCrossing *gdk_event,
-                           wxWindowGTK *win )
+gboolean
+wxGTKImpl::WindowEnterCallback(GtkWidget* widget,
+                               GdkEventCrossing* gdk_event,
+                               wxWindowGTK* win)
 {
     wxLogTrace(TRACE_MOUSE, "Window enter in %s (window %p) for window %p",
                wxDumpWindow(win), gtk_widget_get_window(widget), gdk_event->window);
@@ -2297,14 +2299,26 @@ gtk_window_enter_callback( GtkWidget* widget,
     return win->GTKProcessEvent(event);
 }
 
+extern "C" {
+
+static gboolean
+gtk_window_enter_callback( GtkWidget* widget,
+                           GdkEventCrossing *gdk_event,
+                           wxWindowGTK *win )
+{
+    return wxGTKImpl::WindowEnterCallback(widget, gdk_event, win);
+}
+
+} // extern "C"
+
 //-----------------------------------------------------------------------------
 // "leave_notify_event"
 //-----------------------------------------------------------------------------
 
-static gboolean
-gtk_window_leave_callback( GtkWidget* widget,
-                           GdkEventCrossing *gdk_event,
-                           wxWindowGTK *win )
+gboolean
+wxGTKImpl::WindowLeaveCallback(GtkWidget* widget,
+                               GdkEventCrossing* gdk_event,
+                               wxWindowGTK* win)
 {
     wxLogTrace(TRACE_MOUSE, "Window leave in %s (window %p) for window %p",
                wxDumpWindow(win), gtk_widget_get_window(widget), gdk_event->window);
@@ -2331,6 +2345,16 @@ gtk_window_leave_callback( GtkWidget* widget,
     return win->GTKProcessEvent(event);
 }
 
+extern "C" {
+
+static gboolean
+gtk_window_leave_callback( GtkWidget* widget,
+                           GdkEventCrossing *gdk_event,
+                           wxWindowGTK *win )
+{
+    return wxGTKImpl::WindowLeaveCallback(widget, gdk_event, win);
+}
+
 //-----------------------------------------------------------------------------
 // "value_changed" from scrollbar
 //-----------------------------------------------------------------------------