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-rw-r--r--alot/commands/globals.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/alot/commands/globals.py b/alot/commands/globals.py
index 906117a6..293d4925 100644
--- a/alot/commands/globals.py
+++ b/alot/commands/globals.py
@@ -844,7 +844,7 @@ class ComposeCommand(Command):
self.envelope.attach(sig, filename=name)
logging.debug('attached')
else:
- with open(sig) as f:
+ with open(sig, 'rb') as f:
sigcontent = f.read()
mimetype = helper.guess_mimetype(sigcontent)
if mimetype.startswith('text'):