diff --git a/src/jsdom.cpp b/src/jsdom.cpp
index 7f3eef3..9c12bd7 100644
--- a/src/jsdom.cpp
+++ b/src/jsdom.cpp
@@ -1243,13 +1243,13 @@ Yeah, it makes my head spin too.
 	} else {
 	    v = JS_NewObject(jcx, cp, NULL, owner_root);
 	}
-	vv = OBJECT_TO_JSVAL(v);
+	JS::RootedValue rvv(jcx, OBJECT_TO_JSVAL(v));
 
 /* if no name, then use id as name */
 	if(!symname && idname) {
-	    JS_DefineProperty(jcx, owner_root, idname, vv, NULL, NULL, attr);
+	    JS_DefineProperty(jcx, owner_root, idname, rvv, NULL, NULL, attr);
 	} else if(symname && !dupname) {
-	    JS_DefineProperty(jcx, owner_root, symname, vv, NULL, NULL, attr);
+	    JS_DefineProperty(jcx, owner_root, symname, rvv, NULL, NULL, attr);
 	    if(stringEqual(symname, "action"))
 		establish_property_bool(v, "actioncrash", eb_true, eb_true);
 
@@ -1259,7 +1259,7 @@ Yeah, it makes my head spin too.
 	    establish_property_object(master, symname, v);
 	} else {
 /* tie this to something, to protect it from gc */
-	    JS_DefineProperty(jcx, owner_root, fakePropName(), vv,
+	    JS_DefineProperty(jcx, owner_root, fakePropName(), rvv,
 	       NULL, NULL, JSPROP_READONLY | JSPROP_PERMANENT);
 	}