diff --git a/syntax/ats.vim b/syntax/ats.vim
index 4699367..3e259e7 100644
--- a/syntax/ats.vim
+++ b/syntax/ats.vim
@@ -19,7 +19,7 @@ syn match atsSpecial -\v\\[0-9]+-
 syn region atsString start=+"+ end=+"+ contains=atsSpecial
 
 syn keyword atsKeyword staload dynload overload with fun symintr include fn fnx and prfun prfn praxi castfn sortdef
-syn keyword atsKeyword lam llam fix raise of var val prval if then else addr let in end
+syn keyword atsKeyword lam llam fix raise of var val prval if then else addr let in begin end
 syn keyword atsKeywordTwo case ifcase
 
 syn match atsKeyword "\v[\%\+\-\<\>\=!\:\~]+"