diff --git a/ntoskrnl/ke/i386/thrdini.c b/ntoskrnl/ke/i386/thrdini.c
index cfc497bfc69aa..12e1d3407eda0 100644
--- a/ntoskrnl/ke/i386/thrdini.c
+++ b/ntoskrnl/ke/i386/thrdini.c
@@ -485,6 +485,9 @@ KiDispatchInterrupt(VOID)
     }
     else if (Prcb->NextThread)
     {
+        /* Acquire prcb the lock */
+        KiAcquirePrcbLock(Prcb);
+
         /* Capture current thread data */
         OldThread = Prcb->CurrentThread;
         NewThread = Prcb->NextThread;