diff --git a/AK/JsonValue.h b/AK/JsonValue.h
index 93cea679f3a..a368cd71958 100644
--- a/AK/JsonValue.h
+++ b/AK/JsonValue.h
@@ -69,7 +69,7 @@ public:
     template<typename Builder>
     void serialize(Builder&) const;
 
-    String as_string_or(const String& alternative)
+    String as_string_or(String const& alternative) const
     {
         if (is_string())
             return as_string();