diff --git a/utils/emacs/llvm-mode.el b/utils/emacs/llvm-mode.el
index f72fbcb..578257a 100644
--- a/utils/emacs/llvm-mode.el
+++ b/utils/emacs/llvm-mode.el
@@ -34,7 +34,7 @@
    ;; Arithmetic and Logical Operators
    '("add\\|sub\\|mul\\|div\\|rem\\|and\\|or\\|xor\\|set\\(ne\\|eq\\|lt\\|gt\\|le\\|ge\\)" . font-lock-keyword-face)
    ;; Special instructions
-   '("phi\\|call\\|cast\\|shl\\|shr" . font-lock-keyword-face)
+   '("phi\\|call\\|cast\\|shl\\|shr\\|va_arg" . font-lock-keyword-face)
    ;; Control instructions
    '("ret\\|br\\|switch\\|invoke" . font-lock-keyword-face)
    ;; Memory operators
diff --git a/utils/vim/llvm.vim b/utils/vim/llvm.vim
index 578aeed..dfdc43e 100644
--- a/utils/vim/llvm.vim
+++ b/utils/vim/llvm.vim
@@ -20,7 +20,7 @@
 syn keyword llvmStatement and or xor
 syn keyword llvmStatement setne seteq setlt setgt setle setge
 
-syn keyword llvmStatement phi call cast shl shr
+syn keyword llvmStatement phi call cast shl shr va_arg
 syn keyword llvmStatement ret br switch invoke
 syn keyword llvmStatement malloc alloca free load store getelementptr