diff --git a/IkiWiki/Plugin/htmlscrubber.pm b/IkiWiki/Plugin/htmlscrubber.pm
index 329afde26..7ce07ee9a 100644
--- a/IkiWiki/Plugin/htmlscrubber.pm
+++ b/IkiWiki/Plugin/htmlscrubber.pm
@@ -15,14 +15,14 @@ sub import { #{{{
# Only known uri schemes are allowed to avoid all the ways of
# embedding javascrpt.
# List at http://en.wikipedia.org/wiki/URI_scheme
- my $uri_schemes=join("|",
+ my $uri_schemes=join("|", map quotemeta,
# IANA registered schemes
"http", "https", "ftp", "mailto", "file", "telnet", "gopher",
"aaa", "aaas", "acap", "cap", "cid", "crid",
"dav", "dict", "dns", "fax", "go", "h323", "im", "imap",
"ldap", "mid", "news", "nfs", "nntp", "pop", "pres",
"sip", "sips", "snmp", "tel", "urn", "wais", "xmpp",
- "z39\.50r", "z39\.50s",
+ "z39.50r", "z39.50s",
# Selected unofficial schemes
"aim", "callto", "cvs", "ed2k", "feed", "fish", "gg",
"irc", "ircs", "lastfm", "ldaps", "magnet", "mms",