diff --git a/dlls/jscript/object.c b/dlls/jscript/object.c
index f5ce564f43e..e8624bd79aa 100644
--- a/dlls/jscript/object.c
+++ b/dlls/jscript/object.c
@@ -145,9 +145,9 @@ static void Object_destructor(DispatchEx *dispex)
 }
 
 static const builtin_prop_t Object_props[] = {
-    {hasOwnPropertyW,        Object_hasOwnProperty,        PROPF_METHOD},
-    {isPrototypeOfW,         Object_isPrototypeOf,         PROPF_METHOD},
-    {propertyIsEnumerableW,  Object_propertyIsEnumerable,  PROPF_METHOD},
+    {hasOwnPropertyW,        Object_hasOwnProperty,        PROPF_METHOD|1},
+    {isPrototypeOfW,         Object_isPrototypeOf,         PROPF_METHOD|1},
+    {propertyIsEnumerableW,  Object_propertyIsEnumerable,  PROPF_METHOD|1},
     {toLocaleStringW,        Object_toLocaleString,        PROPF_METHOD},
     {toStringW,              Object_toString,              PROPF_METHOD},
     {valueOfW,               Object_valueOf,               PROPF_METHOD}
diff --git a/dlls/jscript/tests/api.js b/dlls/jscript/tests/api.js
index d4c4cabebae..8b4316f39cb 100644
--- a/dlls/jscript/tests/api.js
+++ b/dlls/jscript/tests/api.js
@@ -1543,4 +1543,13 @@ testFunctions(Math, [
         ["tan", 1]
     ]);
 
+testFunctions(Object.prototype, [
+        ["hasOwnProperty", 1],
+        ["isPrototypeOf", 1],
+        ["propertyIsEnumerable", 1],
+        ["toLocaleString", 0],
+        ["toString", 0],
+        ["valueOf", 0]
+    ]);
+
 reportSuccess();