diff --git a/t1/src/LaneZvbb.scala b/t1/src/LaneZvbb.scala
index d41221084..d38f0a53a 100644
--- a/t1/src/LaneZvbb.scala
+++ b/t1/src/LaneZvbb.scala
@@ -64,6 +64,6 @@ class LaneZvbb(val parameter: LaneZvbbParam)
       zvbbSLL,
     )
   )
-  response.source2 = Mux(request.opcode == 7.U, zvbbSLLMSB, 0.U)
+  response.source2 := Mux(request.opcode === 7.U, zvbbSLLMSB, 0.U)
 }