diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 63d6fc9ebed..03abe1092ec 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -998,6 +998,15 @@ void WINAPI KeInitializeMutex(PRKMUTEX Mutex, ULONG Level)
 }
 
 
+/***********************************************************************
+ *           KeInitializeSemaphore   (NTOSKRNL.EXE.@)
+ */
+void WINAPI KeInitializeSemaphore( PRKSEMAPHORE Semaphore, LONG Count, LONG Limit )
+{
+    FIXME( "(%p %d %d) stub\n", Semaphore , Count, Limit );
+}
+
+
 /***********************************************************************
  *           KeInitializeSpinLock   (NTOSKRNL.EXE.@)
  */
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index f6402af3e8b..f6d213feabf 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -551,7 +551,7 @@
 @ stub KeInitializeMutant
 @ stdcall KeInitializeMutex(ptr long)
 @ stub KeInitializeQueue
-@ stub KeInitializeSemaphore
+@ stdcall KeInitializeSemaphore(ptr long long)
 @ stdcall KeInitializeSpinLock(ptr)
 @ stdcall KeInitializeTimer(ptr)
 @ stdcall KeInitializeTimerEx(ptr long)
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index 3bc7238c04a..b8f51496f74 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -59,6 +59,11 @@ typedef struct _KEVENT {
   DISPATCHER_HEADER  Header;
 } KEVENT, *PKEVENT, *RESTRICTED_POINTER PRKEVENT;
 
+typedef struct _KSEMAPHORE {
+  DISPATCHER_HEADER  Header;
+  LONG Limit;
+} KSEMAPHORE, *PKSEMAPHORE, *PRKSEMAPHORE;
+
 typedef struct _KDPC {
   CSHORT  Type;
   UCHAR  Number;