lib/PublicInbox/MID.pm | 2 +-

diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index 369bb034c8dd9d5c03ce4beb2e35d1c5fc632a9c..5aeffb8c675bb2882a1f50b92505206e386191e9 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -125,7 +125,7 @@ 	\@ret;
 }
 
 # RFC3986, section 3.3:
-sub MID_ESC () { '^A-Za-z0-9\-\._~!\$\&\';\(\)\*\+,;=:@' }
+sub MID_ESC () { '^A-Za-z0-9\-\._~!\$\&\'\(\)\*\+,;=:@' }
 sub mid_escape ($) { uri_escape_utf8($_[0], MID_ESC) }
 
 1;