diff --git a/reactos/ntoskrnl/ke/thrdobj.c b/reactos/ntoskrnl/ke/thrdobj.c
index 15a18b59583..75b11f442c6 100644
--- a/reactos/ntoskrnl/ke/thrdobj.c
+++ b/reactos/ntoskrnl/ke/thrdobj.c
@@ -803,8 +803,8 @@ KeInitThread(IN OUT PKTHREAD Thread,
     Thread->ServiceTable = KeServiceDescriptorTable;
 
     /* Setup APC Fields */
-    InitializeListHead(&Thread->ApcState.ApcListHead[0]);
-    InitializeListHead(&Thread->ApcState.ApcListHead[1]);
+    InitializeListHead(&Thread->ApcState.ApcListHead[KernelMode]);
+    InitializeListHead(&Thread->ApcState.ApcListHead[UserMode]);
     Thread->ApcState.Process = Process;
     Thread->ApcStatePointer[OriginalApcEnvironment] = &Thread->ApcState;
     Thread->ApcStatePointer[AttachedApcEnvironment] = &Thread->SavedApcState;