diff --git a/src/gtk/button.cpp b/src/gtk/button.cpp
index 35e0b4f537..b0d9a4a613 100644
--- a/src/gtk/button.cpp
+++ b/src/gtk/button.cpp
@@ -80,7 +80,7 @@ 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 d65e1a1ab1..a8955a5791 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -2706,7 +2706,7 @@ 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 );
             }
         }