diff --git a/src/java/me/topchetoeu/jscript/core/engine/values/FunctionValue.java b/src/java/me/topchetoeu/jscript/core/engine/values/FunctionValue.java
index dbc3e53..61178dc 100644
--- a/src/java/me/topchetoeu/jscript/core/engine/values/FunctionValue.java
+++ b/src/java/me/topchetoeu/jscript/core/engine/values/FunctionValue.java
@@ -6,7 +6,6 @@ import me.topchetoeu.jscript.core.engine.Context;
 
 public abstract class FunctionValue extends ObjectValue {
     public String name = "";
-    public boolean special = false;
     public int length;
 
     @Override
diff --git a/src/java/me/topchetoeu/jscript/core/engine/values/Values.java b/src/java/me/topchetoeu/jscript/core/engine/values/Values.java
index 39cd674..e2c1be7 100644
--- a/src/java/me/topchetoeu/jscript/core/engine/values/Values.java
+++ b/src/java/me/topchetoeu/jscript/core/engine/values/Values.java
@@ -411,7 +411,7 @@ public class Values {
 
             var ret = call(ctx, func, res, args);
 
-            if (ret != null && func instanceof FunctionValue && ((FunctionValue)func).special) return ret;
+            if (!isPrimitive(ret)) return ret;
             return res;
         }
         catch (IllegalArgumentException e) {
diff --git a/src/java/me/topchetoeu/jscript/utils/interop/NativeWrapperProvider.java b/src/java/me/topchetoeu/jscript/utils/interop/NativeWrapperProvider.java
index 9cf7dd1..bf2ef51 100644
--- a/src/java/me/topchetoeu/jscript/utils/interop/NativeWrapperProvider.java
+++ b/src/java/me/topchetoeu/jscript/utils/interop/NativeWrapperProvider.java
@@ -247,8 +247,6 @@ public class NativeWrapperProvider implements WrapperProvider {
             new NativeFunction(getName(clazz), args -> { throw EngineException.ofError("This constructor is not invokable."); }) :
             create(getName(clazz), constr);
 
-        res.special = true;
-
         apply(res, ctx, ExposeTarget.CONSTRUCTOR, clazz);
 
         return res;