diff --git a/Parser/parser.h b/Parser/parser.h
index bdca3e9..403236d 100644
--- a/Parser/parser.h
+++ b/Parser/parser.h
@@ -7,7 +7,7 @@
 
 /* Parser interface */
 
-#define MAXSTACK 500
+#define MAXSTACK 1500
 
 typedef struct {
 	int		 s_state;	/* State in current DFA */