diff --git a/reactos/dll/win32/syssetup/install.c b/reactos/dll/win32/syssetup/install.c
index 46578f022a3..9fb0602f07d 100644
--- a/reactos/dll/win32/syssetup/install.c
+++ b/reactos/dll/win32/syssetup/install.c
@@ -507,7 +507,7 @@ cleanup:
 }
 
 
-static BOOL CALLBACK
+static INT_PTR CALLBACK
 StatusMessageWindowProc(
     IN HWND hwndDlg,
     IN UINT uMsg,