diff --git a/modules/rostests/winetests/advpack/advpack.c b/modules/rostests/winetests/advpack/advpack.c
index 8d7c5ebb485..5bd39f76fdb 100644
--- a/modules/rostests/winetests/advpack/advpack.c
+++ b/modules/rostests/winetests/advpack/advpack.c
@@ -189,14 +189,14 @@ static void delnode_test(void)
     ok (hr == S_OK, "DelNode failed deleting a directory containing multiple files\n");
 }
 
-static void append_str(char **str, const char *data, ...)
+static void WINAPIV append_str(char **str, const char *data, ...)
 {
-    va_list valist;
+    __ms_va_list valist;
 
-    va_start(valist, data);
+    __ms_va_start(valist, data);
     vsprintf(*str, data, valist);
     *str += strlen(*str);
-    va_end(valist);
+    __ms_va_end(valist);
 }
 
 static void create_inf_file(void)