diff --git a/reactos/include/ddk/winddk.h b/reactos/include/ddk/winddk.h
index 3f1024c3e2c..5cf6c76bbfe 100644
--- a/reactos/include/ddk/winddk.h
+++ b/reactos/include/ddk/winddk.h
@@ -9878,6 +9878,7 @@ NTAPI
 PsTerminateSystemThread(
   IN NTSTATUS  ExitStatus);
 
+extern NTSYSAPI PEPROCESS PsInitialSystemProcess;
 
 
 /** Security reference monitor routines **/