diff --git a/api/exec/compose_stack.go b/api/exec/compose_stack.go
index a30314ca6..3bdb43430 100644
--- a/api/exec/compose_stack.go
+++ b/api/exec/compose_stack.go
@@ -93,7 +93,7 @@ func (manager *ComposeStackManager) fetchEndpointProxy(endpoint *portainer.Endpo
 		return "", nil, err
 	}
 
-	return fmt.Sprintf("http://127.0.0.1:%d", proxy.Port), proxy, nil
+	return fmt.Sprintf("tcp://127.0.0.1:%d", proxy.Port), proxy, nil
 }
 
 func createEnvFile(stack *portainer.Stack) (string, error) {