diff --git a/test/http/http2_connection_test.cpp b/test/http/http2_connection_test.cpp
index dc71ef3..81c78a9 100644
--- a/test/http/http2_connection_test.cpp
+++ b/test/http/http2_connection_test.cpp
@@ -2,6 +2,7 @@
 #include "http/http2_connection.hpp"
 #include "http/http_request.hpp"
 #include "http/http_response.hpp"
+#include "nghttp2_adapters.hpp"
 
 #include <nghttp2/nghttp2.h>
 #include <unistd.h>