diff --git a/reactos/ntoskrnl/ps/process.c b/reactos/ntoskrnl/ps/process.c
index a2b01c105a1..6c6dba38d4b 100644
--- a/reactos/ntoskrnl/ps/process.c
+++ b/reactos/ntoskrnl/ps/process.c
@@ -2426,7 +2426,7 @@ PsLockProcess(PEPROCESS Process, BOOL Timeout)
                                        KernelMode,
                                        FALSE,
                                        Delay);
-        if(NT_SUCCESS(Status))
+        if(!NT_SUCCESS(Status))
         {
 #ifndef NDEBUG
           if(Status == STATUS_TIMEOUT)