diff --git a/src/gtk/minifram.cpp b/src/gtk/minifram.cpp
index cfbd40bae0..e0fa77f064 100644
--- a/src/gtk/minifram.cpp
+++ b/src/gtk/minifram.cpp
@@ -366,6 +366,9 @@ bool wxMiniFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title
     if (style & wxRESIZE_BORDER)
        m_gdkFunc = GDK_FUNC_RESIZE;
 
+    // need to reset default size after changing m_gdkDecor
+    gtk_window_set_default_size(GTK_WINDOW(m_widget), m_width, m_height);
+
     if (m_parent && (GTK_IS_WINDOW(m_parent->m_widget)))
     {
         gtk_window_set_transient_for( GTK_WINDOW(m_widget), GTK_WINDOW(m_parent->m_widget) );