diff --git a/tests/impl_test_sot_external_interface.cpp b/tests/impl_test_sot_external_interface.cpp
index e162b677b75cb18a6aa193e76424a849ddaa535b..607ca5e837132443d198320019f7c6e0246e3f2c 100644
--- a/tests/impl_test_sot_external_interface.cpp
+++ b/tests/impl_test_sot_external_interface.cpp
@@ -55,6 +55,7 @@ void ImplTestSotExternalInterface::init() {
   double ts = 0.001;
 
   py_inter_ptr->declare_parameter<double>("/sot_controller/dt", ts);
+  py_interpreter_srv_->start_ros_service();
   device_->timeStep(ts);
 }