... 3.2 ...

diff --git a/zonemaker/zone.py b/zonemaker/zone.py
index 330c1842d3978440f1bf54127dc482d7062de472..add2bde8c4df333b6f17baa70318d53435df096a 100644 (file)
--- a/zonemaker/zone.py
+++ b/zonemaker/zone.py
@@ -258,7 +258,7 @@ class Zone:
         try:
             with open(self._serialfile) as f:
                 cur_serial = int(f.read())
-        except OSError: # FileNotFoundError has been added in Python 3.3
+        except (OSError, IOError): # FileNotFoundError has been added in Python 3.3
             pass
         # increment serial
         cur_serial += 1