diff --git a/src/test_lib_json/main.cpp b/src/test_lib_json/main.cpp
index 3fe7c01..9d5886d 100644
--- a/src/test_lib_json/main.cpp
+++ b/src/test_lib_json/main.cpp
@@ -11,6 +11,7 @@
 #endif
 
 #include "fuzz.h"
+#include "fuzz.cpp"
 #include "jsontest.h"
 #include <cmath>
 #include <cstring>