diff --git a/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs b/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs
index b55d57b7..51923962 100644
--- a/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs
+++ b/Lombiq.HelpfulLibraries.AspNetCore/Localization/LocalizedHtmlStringConverter.cs
@@ -51,6 +51,6 @@ public override LocalizedHtmlString ReadJson(
             return new LocalizedHtmlString(name, value, isResourceNotFound == true);
         }
 
-        throw new InvalidOperationException($"Can't parse token \"{token}\". It should be object or string");
+        throw new InvalidOperationException($"Can't parse token \"{token}\". It should be an object or a string");
     }
 }