1 files changed, 5 insertions, 1 deletions
diff --git a/source/slang/syntax.cpp b/source/slang/syntax.cpp
index 4e1778e6e..70730ff95 100644
--- a/source/slang/syntax.cpp
+++ b/source/slang/syntax.cpp
@@ -1579,7 +1579,11 @@ void Type::accept(IValVisitor* visitor, void* extra)
                 }
             }
         }
-        return this;
+        RefPtr<DeclaredSubtypeWitness> rs = new DeclaredSubtypeWitness();
+        rs->sub = sub->SubstituteImpl(subst, ioDiff).As<Type>();
+        rs->sup = sup->SubstituteImpl(subst, ioDiff).As<Type>();
+        rs->declRef = declRef.SubstituteImpl(subst, ioDiff);
+        return rs;
     }
 
     String DeclaredSubtypeWitness::ToString()