diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 6fc0fb2a2a7..2543ca6ea09 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -1604,6 +1604,15 @@ NTSTATUS WINAPI PsSetLoadImageNotifyRoutine(PLOAD_IMAGE_NOTIFY_ROUTINE routine)
     return STATUS_SUCCESS;
 }
 
+/*****************************************************
+ *           PsLookupProcessByProcessId  (NTOSKRNL.EXE.@)
+ */
+NTSTATUS WINAPI PsLookupProcessByProcessId(HANDLE processid, PEPROCESS *process)
+{
+    FIXME("(%p %p) stub\n", processid, process);
+    return STATUS_NOT_IMPLEMENTED;
+}
+
 /*****************************************************
  *           DllMain
  */
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 7e4918f27e0..64aaf395cf0 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -892,7 +892,7 @@
 @ stub PsIsThreadImpersonating
 @ stub PsIsThreadTerminating
 @ stub PsJobType
-@ stub PsLookupProcessByProcessId
+@ stdcall PsLookupProcessByProcessId(ptr ptr)
 @ stub PsLookupProcessThreadByCid
 @ stub PsLookupThreadByThreadId
 @ stub PsProcessType