diff --git a/jerry-core/ecma/operations/ecma-proxy-object.c b/jerry-core/ecma/operations/ecma-proxy-object.c
index 93ce2b52f..e051a8b12 100644
--- a/jerry-core/ecma/operations/ecma-proxy-object.c
+++ b/jerry-core/ecma/operations/ecma-proxy-object.c
@@ -806,6 +806,7 @@ ecma_proxy_object_get_own_property_descriptor (ecma_object_t *obj_p, /**< proxy
                                                              is_extensible);
 
   bool target_has_desc = ecma_is_value_true (target_status);
+  bool target_is_writable = (target_desc.flags & ECMA_PROP_IS_WRITABLE) ;
   bool target_is_configurable = false;
 
   if (target_has_desc)
@@ -829,6 +830,14 @@ ecma_proxy_object_get_own_property_descriptor (ecma_object_t *obj_p, /**< proxy
       ecma_free_property_descriptor (prop_desc_p);
       return ecma_raise_type_error (ECMA_ERR_MSG ("Not compatible."));
     }
+
+    /* ES11: 17.b */
+    if ((prop_desc_p->flags & (ECMA_PROP_IS_WRITABLE_DEFINED | ECMA_PROP_IS_WRITABLE)) == ECMA_PROP_IS_WRITABLE_DEFINED
+        && target_is_writable)
+    {
+      ecma_free_property_descriptor (prop_desc_p);
+      return ecma_raise_type_error (ECMA_ERR_MSG ("Not compatible."));
+    }
   }
   return ECMA_VALUE_TRUE;
 } /* ecma_proxy_object_get_own_property_descriptor */
@@ -967,6 +976,16 @@ ecma_proxy_object_define_own_property (ecma_object_t *obj_p, /**< proxy object *
       ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Trap returned truish for defining non-configurable property "
                                                        "which is configurable in the target"));
     }
+    /* ES11: 16.c */
+    else if ((target_desc.flags & (ECMA_PROP_IS_VALUE_DEFINED | ECMA_PROP_IS_WRITABLE_DEFINED)) != 0
+             && (prop_desc_p->flags & (ECMA_PROP_IS_WRITABLE_DEFINED | ECMA_PROP_IS_WRITABLE))
+                 == ECMA_PROP_IS_WRITABLE_DEFINED
+             && (target_desc.flags & (ECMA_PROP_IS_WRITABLE | ECMA_PROP_IS_CONFIGURABLE)) == ECMA_PROP_IS_WRITABLE)
+
+    {
+      ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Trap returned truish for defining non-configurable property "
+                                                       "which is configurable in the target"));
+    }
 
     ecma_free_property_descriptor (&target_desc);
 
@@ -1389,6 +1408,13 @@ ecma_proxy_object_delete_property (ecma_object_t *obj_p, /**< proxy object */
     ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Trap returned truish for property which is "
                                                      "non-configurable in the proxy target."));
   }
+  /* ES11: 13-14 */
+  ecma_value_t extensible_target = ecma_builtin_object_object_is_extensible (target_obj_p);
+
+  if (!ecma_is_value_true (extensible_target))
+  {
+    ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Trap returned truish for target is not extensible"));
+  }
 
   ecma_free_property_descriptor (&target_desc);
 
diff --git a/tests/jerry/es.next/proxy_define_own_property.js b/tests/jerry/es.next/proxy_define_own_property.js
index 5f05b995e..cef7e391f 100644
--- a/tests/jerry/es.next/proxy_define_own_property.js
+++ b/tests/jerry/es.next/proxy_define_own_property.js
@@ -174,3 +174,27 @@ try {
 } catch (e) {
   assert(e instanceof TypeError);
 }
+
+var trapCalls = 0;
+var p = new Proxy({}, {
+  defineProperty: function(t, prop, desc) {
+    Object.defineProperty(t, prop, {
+      configurable: false,
+      writable: true,
+    });
+
+    trapCalls++;
+    return true;
+  },
+});
+
+try {
+  Reflect.defineProperty (p, "prop", {
+    writable: false,
+  });
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+assert (trapCalls == 1)
diff --git a/tests/jerry/es.next/proxy_delete.js b/tests/jerry/es.next/proxy_delete.js
index 1cd21ce74..74367f018 100644
--- a/tests/jerry/es.next/proxy_delete.js
+++ b/tests/jerry/es.next/proxy_delete.js
@@ -162,3 +162,21 @@ try {
 } catch (e) {
   assert(e instanceof TypeError);
 }
+
+var trapCalls = 0;
+var p = new Proxy({prop: 1}, {
+  deleteProperty: function(t, prop) {
+    Object.preventExtensions(t);
+    trapCalls++;
+    return true;
+  },
+});
+
+try {
+  Reflect.deleteProperty (p, "prop");
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+assert (trapCalls == 1);
diff --git a/tests/jerry/es.next/proxy_get_own_property_descriptor.js b/tests/jerry/es.next/proxy_get_own_property_descriptor.js
index aa8f2919f..37acd2f06 100644
--- a/tests/jerry/es.next/proxy_get_own_property_descriptor.js
+++ b/tests/jerry/es.next/proxy_get_own_property_descriptor.js
@@ -282,3 +282,30 @@ Object.assign({}, proxy);
 assert(result.length === 2);
 assert(result[0] === "foo");
 assert(result[1] === "bar");
+
+
+var trapCalls = 0;
+var p = new Proxy({}, {
+  getOwnPropertyDescriptor: function(t, prop) {
+    Object.defineProperty(t, prop, {
+      configurable: false,
+      writable: true,
+    });
+
+    trapCalls++;
+    return {
+      configurable: false,
+      writable: false,
+    };
+  },
+});
+
+try
+{
+  Object.getOwnPropertyDescriptor(p, "prop");
+  assert (false)
+}
+catch (e)
+{
+  assert(e instanceof TypeError)
+}
diff --git a/tests/test262-esnext-excludelist.xml b/tests/test262-esnext-excludelist.xml
index 377092e9e..925e832b1 100644
--- a/tests/test262-esnext-excludelist.xml
+++ b/tests/test262-esnext-excludelist.xml
@@ -1341,12 +1341,10 @@
   <test id="built-ins/Proxy/defineProperty/targetdesc-configurable-desc-not-configurable-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/defineProperty/targetdesc-not-compatible-descriptor-not-configurable-target-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/defineProperty/targetdesc-not-compatible-descriptor-realm.js"><reason></reason></test>
-  <test id="built-ins/Proxy/defineProperty/targetdesc-not-configurable-writable-desc-not-writable.js"><reason></reason></test>
   <test id="built-ins/Proxy/defineProperty/targetdesc-undefined-not-configurable-descriptor-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/defineProperty/targetdesc-undefined-target-is-not-extensible-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/defineProperty/trap-is-not-callable-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/defineProperty/trap-is-undefined-target-is-proxy.js"><reason></reason></test>
-  <test id="built-ins/Proxy/deleteProperty/targetdesc-is-configurable-target-is-not-extensible.js"><reason></reason></test>
   <test id="built-ins/Proxy/deleteProperty/trap-is-missing-target-is-proxy.js"><reason></reason></test>
   <test id="built-ins/Proxy/deleteProperty/trap-is-not-callable-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/deleteProperty/trap-is-null-target-is-proxy.js"><reason></reason></test>
@@ -1355,7 +1353,6 @@
   <test id="built-ins/Proxy/get-fn-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/get/trap-is-not-callable-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/getOwnPropertyDescriptor/result-type-is-not-object-nor-undefined-realm.js"><reason></reason></test>
-  <test id="built-ins/Proxy/getOwnPropertyDescriptor/resultdesc-is-not-configurable-not-writable-targetdesc-is-writable.js"><reason></reason></test>
   <test id="built-ins/Proxy/getOwnPropertyDescriptor/trap-is-not-callable-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/getPrototypeOf/trap-is-not-callable-realm.js"><reason></reason></test>
   <test id="built-ins/Proxy/has/trap-is-not-callable-realm.js"><reason></reason></test>