diff --git a/mobile/android/base/webapp/EventListener.java b/mobile/android/base/webapp/EventListener.java
index 03fa1de4113..d319b9eaf40 100644
--- a/mobile/android/base/webapp/EventListener.java
+++ b/mobile/android/base/webapp/EventListener.java
@@ -115,7 +115,7 @@ public class EventListener implements GeckoEventListener {
             } else if (event.equals("Webapps:GetApkVersions")) {
                 JSONObject obj = new JSONObject();
                 obj.put("versions", getApkVersions(GeckoAppShell.getGeckoInterface().getActivity(),
-                                                   message.getJSONArray("packageNames")).toString());
+                                                   message.getJSONArray("packageNames")));
                 EventDispatcher.sendResponse(message, obj);
             }
         } catch (Exception e) {
diff --git a/mobile/android/modules/WebappManager.jsm b/mobile/android/modules/WebappManager.jsm
index f21d05c49b4..ff3fca8d435 100644
--- a/mobile/android/modules/WebappManager.jsm
+++ b/mobile/android/modules/WebappManager.jsm
@@ -275,7 +275,7 @@ this.WebappManager = {
 
       // Map APK names to APK versions.
       let apkNameToVersion = yield this._getAPKVersions(installedApps.map(app =>
-        app.packageName).filter(packageName => !!packageName)
+        app.apkPackageName).filter(apkPackageName => !!apkPackageName)
       );
 
       // Map manifest URLs to APK versions, which is what the service needs
@@ -286,7 +286,7 @@ this.WebappManager = {
       let manifestUrlToApkVersion = {};
       let manifestUrlToApp = {};
       for (let app of installedApps) {
-        manifestUrlToApkVersion[app.manifestURL] = apkNameToVersion[app.packageName] || 0;
+        manifestUrlToApkVersion[app.manifestURL] = apkNameToVersion[app.apkPackageName] || 0;
         manifestUrlToApp[app.manifestURL] = app;
       }