diff --git a/reactos/lib/rtl/process.c b/reactos/lib/rtl/process.c
index b914fbadc4f..b8585b0fe6f 100644
--- a/reactos/lib/rtl/process.c
+++ b/reactos/lib/rtl/process.c
@@ -362,6 +362,7 @@ RtlSetProcessIsCritical(
     IN   BOOLEAN   IsWinlogon)
 {
 	//TODO
+    UNIMPLEMENTED;
 }
 
 ULONG