diff --git a/test/readinterface_mock.hpp b/test/readinterface_mock.hpp
index 1d2c82d..0b77c8a 100644
--- a/test/readinterface_mock.hpp
+++ b/test/readinterface_mock.hpp
@@ -4,6 +4,9 @@
 
 #include <gmock/gmock.h>
 
+namespace pid_control
+{
+
 class ReadInterfaceMock : public ReadInterface
 {
   public:
@@ -11,3 +14,5 @@
 
     MOCK_METHOD0(read, ReadReturn());
 };
+
+} // namespace pid_control