diff --git a/parse.y b/parse.y
index 53ef6755c0..d77417ae89 100644
--- a/parse.y
+++ b/parse.y
@@ -104,7 +104,8 @@ enum lex_state_e {
     EXPR_VALUE = EXPR_BEG,
     EXPR_BEG_ANY  =  (EXPR_BEG | EXPR_MID | EXPR_CLASS),
     EXPR_ARG_ANY  =  (EXPR_ARG | EXPR_CMDARG),
-    EXPR_END_ANY  =  (EXPR_END | EXPR_ENDARG | EXPR_ENDFN)
+    EXPR_END_ANY  =  (EXPR_END | EXPR_ENDARG | EXPR_ENDFN),
+    EXPR_NONE = 0
 };
 #define IS_lex_state_for(x, ls)	((x) & (ls))
 #define IS_lex_state_all_for(x, ls) (((x) & (ls)) == (ls))