diff --git a/src/gtk/radiobox.cpp b/src/gtk/radiobox.cpp
index 07394f9b9e..86778400df 100644
--- a/src/gtk/radiobox.cpp
+++ b/src/gtk/radiobox.cpp
@@ -226,7 +226,7 @@ bool wxRadioBox::Create( wxWindow *parent, wxWindowID id, const wxString& title,
 
     wxString label;
     GSList *radio_button_group = (GSList *) NULL;
-    for (unsigned int i = 0; i < n; i++)
+    for (unsigned int i = 0; i < (unsigned int)n; i++)
     {
         if ( i != 0 )
             radio_button_group = gtk_radio_button_get_group( GTK_RADIO_BUTTON(m_radio) );