diff --git a/app/src/main/java/org/fdroid/fdroid/AppUpdateStatusService.java b/app/src/main/java/org/fdroid/fdroid/AppUpdateStatusService.java
index e846dd7dc..fcdf0ef3d 100644
--- a/app/src/main/java/org/fdroid/fdroid/AppUpdateStatusService.java
+++ b/app/src/main/java/org/fdroid/fdroid/AppUpdateStatusService.java
@@ -107,6 +107,7 @@ public class AppUpdateStatusService extends IntentService {
             PackageInfo info = getPackageManager().getPackageInfo(downloadedApk.packageName, 0);
             File pathToInstalled = InstalledAppProviderService.getPathToInstalledApk(info);
             if (pathToInstalled != null && pathToInstalled.canRead() &&
+                    pathToInstalled.length() == downloadedApk.size && // Check size before hash for performance.
                     TextUtils.equals(Utils.getBinaryHash(pathToInstalled, "sha256"), downloadedApk.hash)) {
                 Log.i(TAG, downloadedApk.packageName + " is pending install, but we already have the correct version installed.");
                 AppUpdateStatusManager.getInstance(this).markAsNoLongerPendingInstall(downloadedApk.getUrl());