Index: trunk/resources/data/validator/multiple.mapcss
===================================================================
--- trunk/resources/data/validator/multiple.mapcss	(revision 17284)
+++ trunk/resources/data/validator/multiple.mapcss	(revision 17285)
@@ -1,4 +1,4 @@
-/* see #9757, #10869 - Better handling of semicolon in values
-*/
+/* #9757, #10869, #18266 */
+*["telecom:medium" =~ /.+;(.+)?/],
 *["addr:street" =~ /.+;(.+)?/],
 *[highway =~ /.+;(.+)?/],