diff --git a/ubb-la/gui.c b/ubb-la/gui.c
index b17c3d8..fb15c20 100644
--- a/ubb-la/gui.c
+++ b/ubb-la/gui.c
@@ -122,17 +122,18 @@ static void update(void)
 static void textf(int x, int y, uint32_t color, const char *fmt, ...)
 {
 	va_list ap;
-	char *s;
+	char *tmp, *s;
 	uint8_t *p;
 	int ix, iy;
-	int res;
 
 	va_start(ap, fmt);
-	res = vasprintf(&s, fmt, ap);
+	if (vasprintf(&tmp, fmt, ap) < 0) {
+		perror("vasprintf");
+		exit(1);
+	}
 	va_end(ap);
-	(void) res;
 
-	while (*s) {
+	for (s = tmp; *s; s++) {
 		p = gfxPrimitivesFontdata+(*s << 3);
 		for (iy = 0; iy != 8; iy++) {
 			for (ix = 0; ix != 8; ix++)
@@ -141,8 +142,8 @@ static void textf(int x, int y, uint32_t color, const char *fmt, ...)
 			p++;
 		}
 		x += 8;
-		s++;
 	}
+	free(tmp);
 }