diff --git a/main.c b/main.c
index 67f85cf..e5523e4 100644
--- a/main.c
+++ b/main.c
@@ -867,11 +867,25 @@ delete_region(void)
 }
 
 
+void
+kwrite(const int fd, const char *buf, const int len)
+{
+	int	wlen = 0;
+
+	wlen = write(fd, buf, len);
+	assert(wlen != -1);
+	assert(wlen == len);
+	if (wlen == -1) {
+		abort();
+	}
+}
+
+
 void
 die(const char *s)
 {
-	(void)write(STDOUT_FILENO, "\x1b[2J", 4);
-	(void)write(STDOUT_FILENO, "\x1b[H", 3);
+	kwrite(STDOUT_FILENO, "\x1b[2J", 4);
+	kwrite(STDOUT_FILENO, "\x1b[H", 3);
 
 	perror(s);
 	exit(1);
@@ -2150,8 +2164,8 @@ void
 display_clear(struct abuf *ab)
 {
 	if (ab == NULL) {
-		(void)write(STDOUT_FILENO, ESCSEQ "2J", 4);
-		(void)write(STDOUT_FILENO, ESCSEQ "H", 3);
+		kwrite(STDOUT_FILENO, ESCSEQ "2J", 4);
+		kwrite(STDOUT_FILENO, ESCSEQ "H", 3);
 	} else {
 		ab_append(ab, ESCSEQ "2J", 4);
 		ab_append(ab, ESCSEQ "H", 3);
@@ -2365,7 +2379,7 @@ display_refresh(void)
 	/* ab_append(&ab, ESCSEQ "1;2H", 7); */
 	ab_append(&ab, ESCSEQ "?25h", 6);
 
-	(void)write(STDOUT_FILENO, ab.b, ab.len);
+	kwrite(STDOUT_FILENO, ab.b, ab.len);
 	ab_free(&ab);
 }