diff --git a/reactos/include/ndk/umfuncs.h b/reactos/include/ndk/umfuncs.h
index 3af7928823b..16b8f4620fe 100644
--- a/reactos/include/ndk/umfuncs.h
+++ b/reactos/include/ndk/umfuncs.h
@@ -304,7 +304,7 @@ LdrUnloadDll(
     IN PVOID BaseAddress
 );
 
-typedef VOID (NTAPI *PLDR_CALLBACK)(PVOID CallbackContext, PVOID Name);
+typedef VOID (NTAPI *PLDR_CALLBACK)(PVOID CallbackContext, PCHAR Name);
 NTSTATUS
 NTAPI
 LdrVerifyImageMatchesChecksum(