diff --git a/logger.h b/logger.h
index 4c8c89b..3f92ba8 100644
--- a/logger.h
+++ b/logger.h
@@ -278,7 +278,8 @@ class Logger {
 
       return space();
     } else {
-      static_assert(false, "Output for the given type not implemented.");
+      static_assert(sizeof(T) == 0,
+                    "Output for the given type not implemented.");
     }
   }