diff --git a/mode/sh.py b/mode/sh.py
index dd01519..e055265 100644
--- a/mode/sh.py
+++ b/mode/sh.py
@@ -89,7 +89,7 @@ class TestGrammar(Grammar):
 class ShGrammar(Grammar):
     rules = [
         PatternGroupRule(r'vardecl', r'spaces', r'^ +', r'variable', r'[a-zA-Z_][a-zA-Z0-9_]*', r'delimiter', r'='),
-        PatternGroupRule(r'vardecl', r'sh_builtin', r'export', r'spaces', r' +', r'variable', r'[a-zA-Z_][a-zA-Z0-9_]*', r'delimiter', r'='),
+        PatternGroupRule(r'vardecl', r'sh_builtin', r'(?:alias|export)', r'spaces', r' +', r'variable', r'[a-zA-Z_][a-zA-Z0-9_]*', r'delimiter', r'='),
         PatternRule(r'variable', r"^[a-zA-Z_][a-zA-Z0-9_]*(?==)"),
 
         PatternRule(r'spaces', r' +'),