diff --git a/source/core/TensorUtils.hpp b/source/core/TensorUtils.hpp
index d98354597..75be8cdf0 100644
--- a/source/core/TensorUtils.hpp
+++ b/source/core/TensorUtils.hpp
@@ -189,7 +189,7 @@ class MNN_PUBLIC TensorUtils {
     static bool reshapeSlice(Tensor::InsideDescribe::Region& slice, int outside, int inside, int axis);
     
     class FuseRegionStatus;
-    class FuseWrap {
+    class MNN_PUBLIC FuseWrap {
     public:
         FuseWrap();
         ~ FuseWrap();