diff --git a/reactos/include/ndk/rtlfuncs.h b/reactos/include/ndk/rtlfuncs.h
index 58923d9a30c..fad5bbf8c07 100644
--- a/reactos/include/ndk/rtlfuncs.h
+++ b/reactos/include/ndk/rtlfuncs.h
@@ -2323,7 +2323,7 @@ RtlDetermineDosPathNameType_U(
 );
 
 NTSYSAPI
-ULONG
+RTL_PATH_TYPE
 NTAPI
 RtlDetermineDosPathNameType_Ustr(
     IN PCUNICODE_STRING Path