diff --git a/lite/kernels/mlu/bridges/argmax_op.cc b/lite/kernels/mlu/bridges/argmax_op.cc
index a85935e528119d65feeae2edd295c1aa51b8b039..b004639f07c79e5cc414e2d60bc1f32ec522f0f5 100644
--- a/lite/kernels/mlu/bridges/argmax_op.cc
+++ b/lite/kernels/mlu/bridges/argmax_op.cc
@@ -91,6 +91,9 @@ int ArgmaxConverter(void* ctx, OpLite* op, KernelBase* kernel) {
   }
   graph->FuseOp(argmax_op);
   CNML_CALL(cnmlDestroyBaseOp(&argmax_op));
+  if (cast_op) {
+    CNML_CALL(cnmlDestroyBaseOp(&cast_op));
+  }
   return SUCCESS;
 }