diff -r fdc6eb1d650d -r ffd574c144d2 hgext/logtoprocess.py
--- a/hgext/logtoprocess.py	Sun Nov 11 17:34:46 2018 +0900
+++ b/hgext/logtoprocess.py	Sun Nov 11 19:35:33 2018 +0900
@@ -66,7 +66,7 @@
         env = {
             b'EVENT': event,
             b'HGPID': os.getpid(),
-            b'MSG1': msg[0] % msg[1:],
+            b'MSG1': msg,
         }
         # keyword arguments get prefixed with OPT_ and uppercased
         env.update((b'OPT_%s' % key.upper(), value)