util: Correcting include

Change-Id: Ia09b0b955f464e76831b34f3dc985a35fd5dd0e1
diff --git a/src/util/event-emitter.hpp b/src/util/event-emitter.hpp
index adbd231..d43bd24 100644
--- a/src/util/event-emitter.hpp
+++ b/src/util/event-emitter.hpp
@@ -48,7 +48,7 @@
 #ifndef NDN_UTIL_EVENT_EMITTER_HPP
 #define NDN_UTIL_EVENT_EMITTER_HPP
 
-#include "common.hpp"
+#include "../common.hpp"
 #include <vector>
 
 namespace ndn {