diff --git a/dlls/msvcr90/tests/msvcr90.c b/dlls/msvcr90/tests/msvcr90.c
index 85dd80b80c1..dd62f3ae6e0 100644
--- a/dlls/msvcr90/tests/msvcr90.c
+++ b/dlls/msvcr90/tests/msvcr90.c
@@ -1876,7 +1876,7 @@ static int WINAPIV _vsnwprintf_wrapper(wchar_t *str, size_t len, const wchar_t *
     return ret;
 }
 
-void test__vsnwprintf(void)
+static void test__vsnwprintf(void)
 {
     int ret;
     WCHAR str[2] = {0};