diff --git a/src/regexp.h b/src/regexp.h
index 15611ed..fee6cc4 100644
--- a/src/regexp.h
+++ b/src/regexp.h
@@ -64,6 +64,7 @@
     lpos_T		startpos[NSUBEXP];
     lpos_T		endpos[NSUBEXP];
     int			rmm_ic;
+    int			rmm_maxcol;	/* when not zero: maximum column */
 } regmmatch_T;
 
 /*