Bugfix: generation numbers must be strings

1 files changed, 2 insertions, 2 deletions

diff --git a/obnamlib/fmt_ga/client.py b/obnamlib/fmt_ga/client.py
index 9ee7ff3f..62d96368 100644
--- a/obnamlib/fmt_ga/client.py
+++ b/obnamlib/fmt_ga/client.py
@@ -166,9 +166,9 @@ class GAClient(object):
     def _new_generation_number(self):
         if self._generations:
             ids = [gen.get_number() for gen in self._generations]
-            return ids[-1] + 1
+            return str(int(ids[-1]) + 1)
         else:
-            return 1
+            return str(1)
 
     def remove_generation(self, gen_number):
         self._load_data()