diff --git a/rostests/apitests/shlwapi/PathIsUNC.c b/rostests/apitests/shlwapi/PathIsUNC.c
index a8309acb5b0..5f10276312b 100644
--- a/rostests/apitests/shlwapi/PathIsUNC.c
+++ b/rostests/apitests/shlwapi/PathIsUNC.c
@@ -25,7 +25,7 @@ static BOOL (WINAPI *pPathIsUNC)(PCWSTR);
 #define CALL_ISUNC(exp, str) \
 do { \
     BOOL ret = pPathIsUNC((str)); \
-    ok(ret == (exp), "Expected %S to be %d, was %d\n", (str), (exp), ret); \
+    ok(ret == (exp), "Expected %ls to be %d, was %d\n", (str), (exp), ret); \
 } while (0)
 
 START_TEST(isuncpath)