diff --git a/application/failure.h b/application/failure.h
index 6001fde..d5e53a3 100644
--- a/application/failure.h
+++ b/application/failure.h
@@ -21,7 +21,7 @@ private:
     std::string m_what;
 };
 
-std::ostream &operator<<(std::ostream &o, const Failure &failure);
+CPP_UTILITIES_EXPORT std::ostream &operator<<(std::ostream &o, const Failure &failure);
 
 } // namespace ApplicationUtilities