diff --git a/test/src/unit-regression2.cpp b/test/src/unit-regression2.cpp
index f65db7e8c..62af67179 100644
--- a/test/src/unit-regression2.cpp
+++ b/test/src/unit-regression2.cpp
@@ -34,7 +34,6 @@ SOFTWARE.
 
 #define JSON_TESTS_PRIVATE
 #include <nlohmann/json.hpp>
-#include <nlohmann/thirdparty/hedley/hedley.hpp>
 using json = nlohmann::json;
 using ordered_json = nlohmann::ordered_json;