diff --git a/app/build.gradle b/app/build.gradle
index 247a8bca..484a9df6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -177,6 +177,7 @@ def downloadBootstrap(String arch, String expectedChecksum, String version) {
     out.close()
 
     def checksum = new BigInteger(1, digest.digest()).toString(16)
+    while (checksum.length() < 64) { checksum = "0" + checksum }
     if (checksum != expectedChecksum) {
         file.delete()
         throw new GradleException("Wrong checksum for " + remoteUrl + ": expected: " + expectedChecksum + ", actual: " + checksum)