diff --git a/test/pid_thermalcontroller_unittest.cpp b/test/pid_thermalcontroller_unittest.cpp
index d95f16e..ef4de66 100644
--- a/test/pid_thermalcontroller_unittest.cpp
+++ b/test/pid_thermalcontroller_unittest.cpp
@@ -8,6 +8,11 @@
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
+namespace pid_control
+{
+namespace
+{
+
 using ::testing::_;
 using ::testing::Return;
 using ::testing::StrEq;
@@ -211,4 +216,7 @@
         p->process();
         EXPECT_EQ(p->getLastInput(), reading);
     }
-}
\ No newline at end of file
+}
+
+} // namespace
+} // namespace pid_control