diff --git a/src/org/fdroid/fdroid/ManageRepo.java b/src/org/fdroid/fdroid/ManageRepo.java
index 519ef2b80..d46d2b093 100644
--- a/src/org/fdroid/fdroid/ManageRepo.java
+++ b/src/org/fdroid/fdroid/ManageRepo.java
@@ -423,6 +423,7 @@ class RepoListFragment extends ListFragment
             final Button addButton = alrt.getButton(DialogInterface.BUTTON_POSITIVE);
             alrt.setTitle(R.string.repo_exists);
             overwriteMessage.setVisibility(View.VISIBLE);
+            newFingerprint = newFingerprint.toUpperCase(Locale.ENGLISH);
             if (repo.fingerprint == null && newFingerprint != null) {
                 // we're upgrading from unsigned to signed repo
                 overwriteMessage.setText(R.string.repo_exists_add_fingerprint);
@@ -469,7 +470,7 @@ class RepoListFragment extends ListFragment
     private void createNewRepo(String address, String fingerprint) {
         ContentValues values = new ContentValues(2);
         values.put(RepoProvider.DataColumns.ADDRESS, address);
-        values.put(RepoProvider.DataColumns.FINGERPRINT, fingerprint);
+        values.put(RepoProvider.DataColumns.FINGERPRINT, fingerprint.toUpperCase(Locale.ENGLISH));
         RepoProvider.Helper.insert(getActivity().getContentResolver(), values);
         finishedAddingRepo();
     }