diff --git a/syntax/ats.vim b/syntax/ats.vim
index 002ff31..d6cf40f 100644
--- a/syntax/ats.vim
+++ b/syntax/ats.vim
@@ -37,7 +37,7 @@ syn keyword atsType implement primplmnt extern
 
 syn match atsParens "[()]"
 
-syn match atsOperator "\v[\@\']"
+syn match atsOperator "\v[\@\'\#]"
 
 syn match atsChar "\v'.'"