diff --git a/src/operator/Stack.cpp b/src/operator/Stack.cpp
index a938f470ded47d65a9b15b93ca66dfe186d61e9f..17502e0f4041411c5e7f794dbf02ae0963a8a173 100644
--- a/src/operator/Stack.cpp
+++ b/src/operator/Stack.cpp
@@ -132,7 +132,7 @@ std::set<std::string> StackOp::getAvailableBackends() const {
 }
 
 void StackOp::forward() {
-    Operator::forward();
+    OperatorTensor::forward();
     ++forwardStep();
 }