diff --git a/test/http/utility_test.cpp b/test/http/utility_test.cpp
index 36725ef..0924597 100644
--- a/test/http/utility_test.cpp
+++ b/test/http/utility_test.cpp
@@ -5,6 +5,7 @@
 #include <boost/url/parse.hpp>
 #include <boost/url/url.hpp>
 #include <boost/url/url_view.hpp>
+#include <nlohmann/json.hpp>
 
 #include <algorithm>
 #include <ctime>