--- a/hgext3rd/evolve/obshistory.py	Mon Nov 04 14:31:08 2019 -0800
+++ b/hgext3rd/evolve/obshistory.py	Mon Nov 04 14:58:58 2019 -0800
@@ -483,8 +483,7 @@
              label=b"evolve.node")
     fm.plain(b' ')
 
-    fm.write(b'rev', b'(%d)', ctx.rev(),
-             label=b"evolve.rev")
+    fm.plain(b'(%d)' % ctx.rev(), label=b"evolve.rev")
     fm.plain(b' ')
 
     fm.write(b'shortdescription', b'%s', shortdescription,