diff --git a/vim/syntax/lsts.vim b/vim/syntax/lsts.vim
index 6d0b8307..9847cd9f 100644
--- a/vim/syntax/lsts.vim
+++ b/vim/syntax/lsts.vim
@@ -1,6 +1,6 @@
 :syntax case match
 
-:syntax keyword lstsKeyword let interface for while if else match import type fragment macro λ as zero
+:syntax keyword lstsKeyword let interface for while if else match import type fragment macro λ as zero in
 :syntax keyword lstsType Bool U8 U16 U32 U64 I8 I16 I32 I64 F32 F64 Nil
 :syntax keyword lstsTODO TODO contained
 :syntax match   lstsOperator /==\|!=\|<=\|>=\|<\|>\|=\|=>\|\:\:\|\.\|+\|-\|\*\|\/\|&\||\|\'&/