diff --git a/src/Umbraco.Core/Models/PublishedContent/PublishedModelFactory.cs b/src/Umbraco.Core/Models/PublishedContent/PublishedModelFactory.cs
index 2528f7c3fd..8be56850d1 100644
--- a/src/Umbraco.Core/Models/PublishedContent/PublishedModelFactory.cs
+++ b/src/Umbraco.Core/Models/PublishedContent/PublishedModelFactory.cs
@@ -68,7 +68,7 @@ namespace Umbraco.Core.Models.PublishedContent
                 var typeName = attribute == null ? type.Name : attribute.ContentTypeAlias;
 
                 if (modelInfos.TryGetValue(typeName, out var modelInfo))
-                    throw new InvalidOperationException($"Both types {type.AssemblyQualifiedName} and {modelInfo.ModelType.AssemblyQualifiedName} want to be a model type for content type with alias \"{typeName}\".");
+                    throw new InvalidOperationException($"Both types '{type.AssemblyQualifiedName}' and '{modelInfo.ModelType.AssemblyQualifiedName}' want to be a model type for content type with alias \"{typeName}\".");
 
                 // have to use an unsafe ctor because we don't know the types, really
                 var modelCtor = ReflectionUtilities.EmitConstructorUnsafe<Func<object, object>>(constructor);