diff --git a/BeefLibs/Beefy2D/src/widgets/DesignEditableAttribute.bf b/BeefLibs/Beefy2D/src/widgets/DesignEditableAttribute.bf
index 5d51a0d9..77096888 100644
--- a/BeefLibs/Beefy2D/src/widgets/DesignEditableAttribute.bf
+++ b/BeefLibs/Beefy2D/src/widgets/DesignEditableAttribute.bf
@@ -6,10 +6,10 @@ namespace Beefy.widgets
 {
     public struct DesignEditableAttribute : Attribute
     {
-        public String DisplayType { get; set; }
-        public String Group { get; set; }
-        public String DisplayName { get; set; }
-        public String SortName { get; set; }
-        public bool DefaultEditString { get; set; }
+        public String DisplayType { get; set mut; }
+        public String Group { get; set mut; }
+        public String DisplayName { get; set mut; }
+        public String SortName { get; set mut; }
+        public bool DefaultEditString { get; set mut; }
     }
 }
diff --git a/IDEHelper/Compiler/BfModule.cpp b/IDEHelper/Compiler/BfModule.cpp
index ebef039b..38c56291 100644
--- a/IDEHelper/Compiler/BfModule.cpp
+++ b/IDEHelper/Compiler/BfModule.cpp
@@ -17473,7 +17473,7 @@ void BfModule::ProcessMethod(BfMethodInstance* methodInstance, bool isInlineDup)
 			}
 			else if (methodDef->mMethodType == BfMethodType_PropertySetter)
 			{
-				if (!methodDef->mIsMutating)
+				if ((!methodDef->mIsMutating) && (mCurTypeInstance->IsValueType()))
 				{
 					Fail("Auto-setter must be marked as 'mut'", methodDef->GetRefNode(), true);
 				}