diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 6a3c9f3db23..cd155f7f9ae 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -511,6 +511,24 @@ void WINAPI KeInitializeTimer( PKTIMER Timer )
 }
 
 
+/**********************************************************************
+ *           KeQueryActiveProcessors   (NTOSKRNL.EXE.@)
+ *
+ * Return the active Processors as bitmask
+ *
+ * RETURNS
+ *   active Processors as bitmask
+ *
+ */
+KAFFINITY WINAPI KeQueryActiveProcessors( void )
+{
+    DWORD_PTR AffinityMask;
+
+    GetProcessAffinityMask( GetCurrentProcess(), &AffinityMask, NULL);
+    return AffinityMask;
+}
+
+
 /***********************************************************************
  *           KeQuerySystemTime   (NTOSKRNL.EXE.@)
  */
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 461bf28e259..dbab0fa0c0f 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -569,7 +569,7 @@
 @ stub KeProfileInterrupt
 @ stub KeProfileInterruptWithSource
 @ stub KePulseEvent
-@ stub KeQueryActiveProcessors
+@ stdcall KeQueryActiveProcessors()
 @ stub KeQueryInterruptTime
 @ stub KeQueryPriorityThread
 @ stub KeQueryRuntimeThread