diff --git a/ikiwiki.setup b/ikiwiki.setup
index 8a2f299af5..064a6b2ecc 100644
--- a/ikiwiki.setup
+++ b/ikiwiki.setup
@@ -133,7 +133,7 @@ timezone: GMT
 # regexp of files that should be skipped
 #exclude: ^(*\.private|Makefile)$
 # specifies the characters that are allowed in source filenames
-wiki_file_chars: -[:alnum:]+/.:_
+wiki_file_chars: -[:alnum:]+/._
 # allow symlinks in the path leading to the srcdir (potentially insecure)
 allow_symlinks_before_srcdir: 0
 # cookie control