diff --git a/dat.h b/dat.h
index 3546903..fb34450 100644
--- a/dat.h
+++ b/dat.h
@@ -27,9 +27,9 @@ enum
 {
 	Maxclients	= 64,
 	Maxkouho	= 32,
-	Maxdisp		= 8,
-	Imgw		= 512,
-	Imgh		= Maxdisp * Fontsz + 8,
+	Maxdisp		= 9,
+	Imgw		= (Maxrunes + 3) * Fontsz,
+	Imgh		= (Maxdisp + 1) * Fontsz,
 
 	Colfg	= 0x000000,
 	Colbg	= 0xffffff,
diff --git a/win.c b/win.c
index f535b39..b588405 100644
--- a/win.c
+++ b/win.c
@@ -78,17 +78,26 @@ drawstr(u32int *buf, int x, int y, Rune *r, int n, int maxw, int maxh)
 	}
 }
 
+static void
+fill(u32int *buf, int n, u32int color)
+{
+	int i;
+
+	for(i = 0; i < n; i++)
+		buf[i] = color;
+}
+
 static void
 drawkouho(Drawcmd *dc, int first, int n, int w, int h)
 {
 	int sely, y, i;
 	Str *s;
 
-	memset(img, (uchar)Colbg, w * h * sizeof(u32int));
+	fill(img, w * h, Colbg);
 	drawstr(img, 0, 0, dc->pre.r, dc->pre.n, w, h);
 	if(dc->sel >= 0){
 		sely = Fontsz + dc->sel * Fontsz;
-		memset(img + sely * w, (uchar)Colsel, Fontsz * w * sizeof(u32int));
+		fill(img + sely * w, Fontsz * w, Colsel);
 	}
 	for(i = 0, y = Fontsz; i < n; i++, y += Fontsz){
 		s = &dc->kouho[first+i];