diff --git a/dnn/src/x86/pooling/opr_impl.cpp b/dnn/src/x86/pooling/opr_impl.cpp
index f26944ce..a6e0cfc3 100644
--- a/dnn/src/x86/pooling/opr_impl.cpp
+++ b/dnn/src/x86/pooling/opr_impl.cpp
@@ -109,7 +109,7 @@ void PoolingImpl::exec(
     if (!is_fallback_algo(algo)) {
         algo->exec(args);
     } else {
-        fallback::PoolingImpl::exec(src, dst, Workspace());
+        fallback::PoolingImpl::exec(src, dst, workspace);
     }
 }