diff --git a/app/components/Browser/index.js b/app/components/Browser/index.js
index 0cd90262898..bb187d13b62 100644
--- a/app/components/Browser/index.js
+++ b/app/components/Browser/index.js
@@ -162,9 +162,6 @@ export default class Browser extends Component {
 					<Icon disabled={!canGoForward} name="refresh" onPress={this.reload} size={20} style={styles.icon} />
 				</View>
 				<WKWebView
-					injectJavaScript={
-						'window.originalPostMessage = window.postMessage; window.postMessage = function (data) { window.webkit.messageHandlers.reactNative.postMessage(data); }'
-					}
 					injectedJavaScriptForMainFrameOnly
 					javaScriptEnabled
 					onMessage={this.onMessage}
diff --git a/package.json b/package.json
index af466631af0..3921d5125fe 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,8 @@
     "format": "prettier **/*.{js,json} --write",
     "start": "node node_modules/react-native/local-cli/cli.js start",
     "test": "jest",
-    "test:update": "jest -u"
+    "test:update": "jest -u",
+    "postinstall": "./scripts/postinstall.sh"
   },
   "prettier": {
     "printWidth": 120,
@@ -38,7 +39,7 @@
     "react-native": "0.56.0",
     "react-native-fs": "^2.10.14",
     "react-native-vector-icons": "^4.6.0",
-    "react-native-wkwebview-reborn": "^1.21.0",
+    "react-native-wkwebview-reborn": "1.21.0",
     "react-navigation": "^2.6.2"
   },
   "devDependencies": {
diff --git a/scripts/postinstall.sh b/scripts/postinstall.sh
new file mode 100755
index 00000000000..185aadc12cc
--- /dev/null
+++ b/scripts/postinstall.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+echo "PostInstall script:"
+
+echo "1 - Fixing WKWebView..."
+WKWEBVIEW_FILE=$(find . -name RCTWKWebView.m);
+sed -i '' -e '143s/WKUserScriptInjectionTimeAtDocumentEnd/WKUserScriptInjectionTimeAtDocumentStart/' $WKWEBVIEW_FILE;
+echo "Done"
\ No newline at end of file