diff --git a/src/gtk/button.cpp b/src/gtk/button.cpp
index e9b395f835..71cfd13497 100644
--- a/src/gtk/button.cpp
+++ b/src/gtk/button.cpp
@@ -71,7 +71,7 @@ gtk_button_style_set_callback( GtkWidget *m_widget, GtkStyle *WXUNUSED(style), w
             right_border += default_border->right;
             top_border += default_border->top;
             bottom_border += default_border->bottom;
-            g_free( default_border );
+            gtk_border_free( default_border );
         }
         win->MoveWindow(
             win->m_x - top_border,
diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 7b24565135..5ccb022670 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -2738,7 +2738,7 @@ void wxWindowGTK::DoSetSize( int x, int y, int width, int height, int sizeFlags
                 right_border += default_border->right;
                 top_border += default_border->top;
                 bottom_border += default_border->bottom;
-                g_free( default_border );
+                gtk_border_free( default_border );
             }
         }