diff --git a/Ja2/MainMenuScreen.cpp b/Ja2/MainMenuScreen.cpp
index f354ed39..d7a339a5 100644
--- a/Ja2/MainMenuScreen.cpp
+++ b/Ja2/MainMenuScreen.cpp
@@ -417,7 +417,7 @@ void MenuButtonCallback(GUI_BUTTON *btn,INT32 reason)
 	}
 }
 
-void MenuButtonMoveCallback(GUI_BUTTON *btn,INT32 reason)
+static void MenuButtonMoveCallback(GUI_BUTTON *btn,INT32 reason)
 {
 	if(reason & MSYS_CALLBACK_REASON_LOST_MOUSE)
 	{