diff --git a/rostests/winetests/cabinet/fdi.c b/rostests/winetests/cabinet/fdi.c
index f90b6f0abea..e9765adb0db 100644
--- a/rostests/winetests/cabinet/fdi.c
+++ b/rostests/winetests/cabinet/fdi.c
@@ -594,7 +594,7 @@ static void test_FDIIsCabinet(void)
 }
 
 
-INT_PTR __cdecl CopyProgress (FDINOTIFICATIONTYPE fdint, PFDINOTIFICATION pfdin)
+static INT_PTR __cdecl CopyProgress(FDINOTIFICATIONTYPE fdint, PFDINOTIFICATION pfdin)
 {
     return 0;
 }