diff --git a/utils/vim/llvm.vim b/utils/vim/llvm.vim
index 9b8a42004ef..2e650b16161 100644
--- a/utils/vim/llvm.vim
+++ b/utils/vim/llvm.vim
@@ -57,7 +57,6 @@ syn keyword llvmKeyword module asm align tail to
 syn keyword llvmKeyword addrspace section alias sideeffect c gc
 syn keyword llvmKeyword target datalayout triple
 syn keyword llvmKeyword blockaddress
-syn keyword llvmKeyword union
 
 " Obsolete keywords.
 syn keyword llvmError  uninitialized implementation