diff --git a/src/os_mswin.c b/src/os_mswin.c
index d4a186d..28f2f08 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -1729,7 +1729,7 @@
 }
 
 /*ARGSUSED*/
-    static INT_PTR CALLBACK
+    static BOOL CALLBACK
 PrintDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
 {
 #ifdef FEAT_GETTEXT