diff --git a/usr.bin/systat/iostat.c b/usr.bin/systat/iostat.c
index b499a8b21046..edeab4b99fb6 100644
--- a/usr.bin/systat/iostat.c
+++ b/usr.bin/systat/iostat.c
@@ -214,7 +214,7 @@ numlabels(row)
 	char tmpstr[10];
 
 #define COLWIDTH	17
-#define DRIVESPERLINE	((wnd->maxx - INSET) / COLWIDTH)
+#define DRIVESPERLINE	((wnd->_maxx - INSET) / COLWIDTH)
 	for (ndrives = 0, i = 0; i < num_devices; i++)
 		if (dev_select[i].selected)
 			ndrives++;
@@ -222,7 +222,7 @@ numlabels(row)
 	/*
 	 * Deduct -regions for blank line after each scrolling region.
 	 */
-	linesperregion = (wnd->maxy - row - regions) / regions;
+	linesperregion = (wnd->_maxy - row - regions) / regions;
 	/*
 	 * Minimum region contains space for two
 	 * label lines and one line of statistics.
@@ -232,9 +232,9 @@ numlabels(row)
 	col = INSET;
 	for (i = 0; i < num_devices; i++)
 		if (dev_select[i].selected) {
-			if (col + COLWIDTH >= wnd->maxx - INSET) {
+			if (col + COLWIDTH >= wnd->_maxx - INSET) {
 				col = INSET, row += linesperregion + 1;
-				if (row > wnd->maxy - (linesperregion + 1))
+				if (row > wnd->_maxy - (linesperregion + 1))
 					break;
 			}
 			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
@@ -260,7 +260,7 @@ barlabels(row)
 	linesperregion = 2 + kbpt;
 	for (i = 0; i < num_devices; i++)
 		if (dev_select[i].selected) {
-			if (row > wnd->maxy - linesperregion)
+			if (row > wnd->_maxy - linesperregion)
 				break;
 			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
 				dev_select[i].unit_number);
@@ -296,7 +296,7 @@ showiostat()
 		row += 2;
 		for (i = 0; i < num_devices; i++)
 			if (dev_select[i].selected) {
-				if (row > wnd->maxy - linesperregion)
+				if (row > wnd->_maxy - linesperregion)
 					break;
 				row = devstats(row, INSET, i);
 			}
@@ -309,9 +309,9 @@ showiostat()
 	winsertln(wnd);
 	for (i = 0; i < num_devices; i++)
 		if (dev_select[i].selected) {
-			if (col + COLWIDTH >= wnd->maxx - INSET) {
+			if (col + COLWIDTH >= wnd->_maxx - INSET) {
 				col = INSET, row += linesperregion + 1;
-				if (row > wnd->maxy - (linesperregion + 1))
+				if (row > wnd->_maxy - (linesperregion + 1))
 					break;
 				wmove(wnd, row + linesperregion, 0);
 				wdeleteln(wnd);
diff --git a/usr.bin/systat/mbufs.c b/usr.bin/systat/mbufs.c
index f542da99e727..5e428618cf0f 100644
--- a/usr.bin/systat/mbufs.c
+++ b/usr.bin/systat/mbufs.c
@@ -103,9 +103,9 @@ showmbufs()
 
 	if (mb == 0)
 		return;
-	for (j = 0; j < wnd->maxy; j++) {
+	for (j = 0; j < wnd->_maxy; j++) {
 		max = 0, index = -1;
-		for (i = 0; i < wnd->maxy; i++) {
+		for (i = 0; i < wnd->_maxy; i++) {
 			if (i == MT_FREE)
 				continue;
 			if (mb->m_mtypes[i] > max) {
diff --git a/usr.bin/systat/netstat.c b/usr.bin/systat/netstat.c
index ba53fdae58ab..305c1339f1fe 100644
--- a/usr.bin/systat/netstat.c
+++ b/usr.bin/systat/netstat.c
@@ -81,7 +81,7 @@ static char *inetname __P((struct in_addr));
 static void inetprint __P((struct in_addr *, int, char *));
 
 #define	streq(a,b)	(strcmp(a,b)==0)
-#define	YMAX(w)		((w)->maxy-1)
+#define	YMAX(w)		((w)->_maxy-1)
 
 WINDOW *
 opennetstat()
diff --git a/usr.bin/systat/pigs.c b/usr.bin/systat/pigs.c
index 8af36c84ad74..ba9b60a87eed 100644
--- a/usr.bin/systat/pigs.c
+++ b/usr.bin/systat/pigs.c
@@ -110,8 +110,8 @@ showpigs()
         qsort(pt, nproc + 1, sizeof (struct p_times), compar);
 	y = 1;
 	i = nproc + 1;
-	if (i > wnd->maxy-1)
-		i = wnd->maxy-1;
+	if (i > wnd->_maxy-1)
+		i = wnd->_maxy-1;
 	for (k = 0; i > 0 && pt[k].pt_pctcpu > 0.01; i--, y++, k++) {
 		if (pt[k].pt_kp == NULL) {
 			uname = "";