diff --git a/utils/vim/syntax/llvm.vim b/utils/vim/syntax/llvm.vim
index 56eb1b19826..1a060ab6514 100644
--- a/utils/vim/syntax/llvm.vim
+++ b/utils/vim/syntax/llvm.vim
@@ -148,6 +148,7 @@ syn keyword llvmKeyword
       \ sspstrong
       \ strictfp
       \ swiftcc
+      \ swiftself
       \ tail
       \ target
       \ thread_local