diff --git a/test/src/unit-noexcept.cpp b/test/src/unit-noexcept.cpp
index cf86e92d5..26b2d4819 100644
--- a/test/src/unit-noexcept.cpp
+++ b/test/src/unit-noexcept.cpp
@@ -42,10 +42,10 @@ enum test
 struct pod {};
 struct pod_bis {};
 
-void to_json(json&, pod) noexcept;
-void to_json(json&, pod_bis);
-void from_json(const json&, pod) noexcept;
-void from_json(const json&, pod_bis);
+void to_json(json&, pod) noexcept{}
+void to_json(json&, pod_bis){}
+void from_json(const json&, pod) noexcept{}
+void from_json(const json&, pod_bis){}
 static json j;
 
 static_assert(noexcept(json{}), "");