diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index c46418e2395..06a1cbd6684 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -2277,14 +2277,6 @@ PRKTHREAD WINAPI KeGetCurrentThread(void)
     return NULL;
 }
 
-/***********************************************************************
- *           KeInitializeSpinLock   (NTOSKRNL.EXE.@)
- */
-void WINAPI KeInitializeSpinLock( PKSPIN_LOCK SpinLock )
-{
-    FIXME( "stub: %p\n", SpinLock );
-}
-
 /***********************************************************************
  *           KeInsertQueue   (NTOSKRNL.EXE.@)
  */
diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c
index da51ca02379..bd58f332582 100644
--- a/dlls/ntoskrnl.exe/sync.c
+++ b/dlls/ntoskrnl.exe/sync.c
@@ -373,3 +373,12 @@ NTSTATUS WINAPI KeDelayExecutionThread( KPROCESSOR_MODE mode, BOOLEAN alertable,
     TRACE("mode %d, alertable %u, timeout %p.\n", mode, alertable, timeout);
     return NtDelayExecution( alertable, timeout );
 }
+
+/***********************************************************************
+ *           KeInitializeSpinLock   (NTOSKRNL.EXE.@)
+ */
+void WINAPI KeInitializeSpinLock( KSPIN_LOCK *lock )
+{
+    TRACE("lock %p.\n", lock);
+    *lock = 0;
+}
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index 077fec13192..3aa1c8a68ef 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -1426,6 +1426,7 @@ PKTHREAD  WINAPI KeGetCurrentThread(void);
 void      WINAPI KeInitializeEvent(PRKEVENT,EVENT_TYPE,BOOLEAN);
 void      WINAPI KeInitializeMutex(PRKMUTEX,ULONG);
 void      WINAPI KeInitializeSemaphore(PRKSEMAPHORE,LONG,LONG);
+void      WINAPI KeInitializeSpinLock(KSPIN_LOCK*);
 void      WINAPI KeInitializeTimerEx(PKTIMER,TIMER_TYPE);
 void      WINAPI KeInitializeTimer(KTIMER*);
 void      WINAPI KeQuerySystemTime(LARGE_INTEGER*);