diff --git a/reactos/ntoskrnl/ntoskrnl.spec b/reactos/ntoskrnl/ntoskrnl.spec
index 50c69883c8b..1b71e74f586 100644
--- a/reactos/ntoskrnl/ntoskrnl.spec
+++ b/reactos/ntoskrnl/ntoskrnl.spec
@@ -1404,12 +1404,12 @@
 @ stdcall -arch=i386,arm WRITE_REGISTER_ULONG(ptr long)
 @ stdcall -arch=i386,arm WRITE_REGISTER_USHORT(ptr long)
 @ stdcall WmiFlushTrace(ptr)
-@ stdcall WmiGetClock(long ptr)
+@ fastcall WmiGetClock(long ptr)
 @ stdcall WmiQueryTrace(ptr)
 @ stdcall WmiQueryTraceInformation(long ptr long ptr ptr)
 @ stdcall WmiStartTrace(ptr)
 @ stdcall WmiStopTrace(ptr)
-@ stdcall WmiTraceFastEvent(ptr)
+@ fastcall WmiTraceFastEvent(ptr)
 @ cdecl WmiTraceMessage()
 @ stdcall WmiTraceMessageVa(double long ptr long long)
 @ stdcall WmiUpdateTrace(ptr)