diff --git a/test/controller_mock.hpp b/test/controller_mock.hpp
index 52c21a9..f1c9d56 100644
--- a/test/controller_mock.hpp
+++ b/test/controller_mock.hpp
@@ -4,6 +4,9 @@
 
 #include <gmock/gmock.h>
 
+namespace pid_control
+{
+
 class ControllerMock : public PIDController
 {
   public:
@@ -17,3 +20,5 @@
     MOCK_METHOD0(setptProc, double());
     MOCK_METHOD1(outputProc, void(double));
 };
+
+} // namespace pid_control