diff --git a/src/regexp.h b/src/regexp.h
index f44578d..9809b3c 100644
--- a/src/regexp.h
+++ b/src/regexp.h
@@ -86,13 +86,15 @@
     regengine_T		*engine;
     unsigned		regflags;
 
-    regprog_T		regprog;
-    nfa_state_T		*start;
+    nfa_state_T		*start;		/* points into state[] */
     int			has_zend;	/* pattern contains \ze */
     int			has_backref;	/* pattern contains \1 .. \9 */
 #ifdef FEAT_SYN_HL
     int			reghasz;
 #endif
+#ifdef DEBUG
+    char_u		*pattern;
+#endif
     int			nsubexp;	/* number of () */
     int			nstate;
     nfa_state_T		state[0];	/* actually longer.. */