diff --git a/src/bin/d2/tests/d2_process_unittests.cc b/src/bin/d2/tests/d2_process_unittests.cc
index b5a8e28b52..ffdf39281f 100644
--- a/src/bin/d2/tests/d2_process_unittests.cc
+++ b/src/bin/d2/tests/d2_process_unittests.cc
@@ -20,7 +20,6 @@
 #include <gtest/gtest.h>
 
 #include <functional>
-#include <sstream>
 
 using namespace std;
 using namespace isc;
@@ -74,6 +73,7 @@ public:
 
     /// @brief Destructor
     virtual ~D2ProcessTest() {
+        D2Controller::instance().reset();
     }
 
     /// @brief Callback that will invoke shutdown method.