diff --git a/grammars/css.cson b/grammars/css.cson
index 40bc180..8c5dab9 100644
--- a/grammars/css.cson
+++ b/grammars/css.cson
@@ -2047,7 +2047,7 @@
         | mrow|ms|mscarries|mscarry|msgroup|msline|mspace|msqrt|msrow|mstack|mstyle|msub|msubsup
         | msup|mtable|mtd|mtext|mtr|munder|munderover|semantics
       )
-      (?=[+~>\\s,.\\#|){:\\[]|/\\*|$)
+      (?=[+~>\\s,.\\#|){\\[]|:[^//s]|/\\*|$)
     '''
     'name': 'entity.name.tag.css'
   'unicode-range':