diff --git a/src/regexp.h b/src/regexp.h
index fee6cc4..09c8d0c 100644
--- a/src/regexp.h
+++ b/src/regexp.h
@@ -64,7 +64,7 @@
     lpos_T		startpos[NSUBEXP];
     lpos_T		endpos[NSUBEXP];
     int			rmm_ic;
-    int			rmm_maxcol;	/* when not zero: maximum column */
+    colnr_T		rmm_maxcol;	/* when not zero: maximum column */
 } regmmatch_T;
 
 /*