1 files changed, 1 insertions, 1 deletions
diff --git a/storage.cpp b/storage.cpp
index e7e9248..a7d5a36 100644
--- a/storage.cpp
+++ b/storage.cpp
@@ -186,7 +186,7 @@ std::string Storage::generate_id()
   for (int i = 0; i < 6; i++) {
    char c{static_cast<char>('0' + uniform_dist(e1))};
    if (c > '9')
-    c = c - '9' + 'a';
+    c = c - '9' - 1 + 'a';
    result.push_back(c);
   }