diff --git a/src/acorn/src/tokentype.js b/src/acorn/src/tokentype.js
index aa0ecdabe2..609e508583 100755
--- a/src/acorn/src/tokentype.js
+++ b/src/acorn/src/tokentype.js
@@ -116,7 +116,7 @@ kw("do", {isLoop: true})
 kw("else", beforeExpr)
 kw("finally")
 kw("for", {isLoop: true})
-kw("function")
+kw("function", startsExpr)
 kw("if")
 kw("return", beforeExpr)
 kw("switch")