diff --git a/drivers/network/afd/afd/lock.c b/drivers/network/afd/afd/lock.c
index 9874e18fb8f..43f0633614c 100644
--- a/drivers/network/afd/afd/lock.c
+++ b/drivers/network/afd/afd/lock.c
@@ -123,6 +123,7 @@ VOID UnlockBuffers( PAFD_WSABUF Buf, UINT Count, BOOL Address ) {
     }
 
     ExFreePool( Buf );
+    Buf = NULL;
 }
 
 /* Produce a kernel-land handle array with handles replaced by object