diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index 2144ea7c631..8ea7b5b06ed 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -1373,7 +1373,7 @@ static INT TREEVIEW_CompareItems(
 /***************************************************************************
  * Forward the DPA local callback to the treeview owner callback
  */
-static INT TREEVIEW_CallBackCompare( 
+static INT WINAPI TREEVIEW_CallBackCompare( 
   LPVOID first, 
   LPVOID second, 
   LPARAM tvInfoPtr)