--- a/hgext/patchbomb.py	Tue Jun 23 22:38:21 2015 -0700
+++ b/hgext/patchbomb.py	Tue Jun 23 22:20:08 2015 -0700
@@ -628,7 +628,7 @@
             try:
                 generator.flatten(m, 0)
                 fp.write('\n')
-            except IOError, inst:
+            except IOError as inst:
                 if inst.errno != errno.EPIPE:
                     raise
             if fp is not ui: