diff --git a/dlls/ntdll/sync.c b/dlls/ntdll/sync.c
index 04b3cd41ce9..004095b02f5 100644
--- a/dlls/ntdll/sync.c
+++ b/dlls/ntdll/sync.c
@@ -297,7 +297,7 @@ NTSTATUS WINAPI NtPulseEvent( HANDLE handle, PULONG PulseCount )
  */
 NTSTATUS WINAPI NtQueryEvent (
 	IN  HANDLE EventHandle,
-	IN  UINT EventInformationClass,
+	IN  EVENT_INFORMATION_CLASS EventInformationClass,
 	OUT PVOID EventInformation,
 	IN  ULONG EventInformationLength,
 	OUT PULONG  ReturnLength)