Index: lib/redmine/wiki_formatting/textile/redcloth3.rb
===================================================================
--- lib/redmine/wiki_formatting/textile/redcloth3.rb	(revision 17169)
+++ lib/redmine/wiki_formatting/textile/redcloth3.rb	(working copy)
@@ -514,7 +514,7 @@
         atts
     end
 
-    STYLES_RE = /^(color|width|height|border|background|padding|margin|font|text|float)(-[a-z]+)*:\s*((\d+%?|\d+px|\d+(\.\d+)?em|#[0-9a-f]+|[a-z]+)\s*)+$/i
+    STYLES_RE = /^(color|(min-|max-)?+(width|height)|border|background|padding|margin|font|text|float)(-[a-z]+)*:\s*((\d+%?|\d+px|\d+(\.\d+)?em|#[0-9a-f]+|[a-z]+)\s*)+$/i
 
     def sanitize_styles(str)
       styles = str.split(";").map(&:strip)
Index: test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb
===================================================================
--- test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb	(revision 17169)
+++ test/unit/lib/redmine/wiki_formatting/textile_formatter_test.rb	(working copy)
@@ -80,6 +80,8 @@
       'p{border-right:1px}. text'    => '<p style="border-right:1px;">text</p>',
       'p{border-top:1px}. text'      => '<p style="border-top:1px;">text</p>',
       'p{border-bottom:1px}. text'   => '<p style="border-bottom:1px;">text</p>',
+      'p{max-width: 100px}. text'    => '<p style="max-width: 100px;">text</p>',
+      'p{width: 50px}. text'         => '<p style="width: 50px;">text</p>',
       }, false)
 
     # multiple styles