diff --git a/package.json b/package.json
index 72240978..914d53c5 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
   "scripts": {
     "clean": "rimraf lib",
     "prebuild": "npm run lint && npm run clean",
+    "build:watch": "npm run build -- --watch",
     "build": "babel src --out-dir lib",
     "lint": "eslint .",
     "pretest:cov": "npm run lint",
@@ -86,6 +87,7 @@
     "invariant": "^2.1.1",
     "lodash.isequal": "^3.0.4",
     "marker-clusterer-plus": "^2.1.2",
+    "react-prop-types-element-of-type": "^1.0.2",
     "scriptjs": "^2.5.8",
     "warning": "^2.1.0"
   },
diff --git a/src/async/ScriptjsLoader.js b/src/async/ScriptjsLoader.js
index 5e4c37d8..db9a9dfe 100644
--- a/src/async/ScriptjsLoader.js
+++ b/src/async/ScriptjsLoader.js
@@ -4,6 +4,10 @@ import {
   PropTypes,
 } from "react";
 
+import {
+  default as propTypesElementOfType,
+} from "react-prop-types-element-of-type";
+
 import {
   default as canUseDOM,
 } from "can-use-dom";
@@ -27,7 +31,7 @@ export default class ScriptjsLoader extends Component {
     ...urlObjDefinition,
     // PropTypes for ScriptjsLoader
     loadingElement: PropTypes.node,
-    googleMapElement: PropTypes.element.isRequired,
+    googleMapElement: propTypesElementOfType(GoogleMap).isRequired,
   }
 
   state = {