diff --git a/cmd-lcd.c b/cmd-lcd.c
index 6348f85..6e4c8b8 100644
--- a/cmd-lcd.c
+++ b/cmd-lcd.c
@@ -115,7 +115,7 @@ int cmd_lcd(int argc, char **argv)
 			for (x = 0; x < lcd_width(); x++)
 				lcd_addpixel(rgb(i++, 0, 0));
 	}
-	else if (is_command(argc, argv, "tps")) {
+	else if (is_command(argc, argv, "tpd")) {
 		static int step = 0;
 		pixel_t *fb;
 		int x, y;
diff --git a/vsprintf.c b/vsprintf.c
index 6d21faf..9b201d7 100644
--- a/vsprintf.c
+++ b/vsprintf.c
@@ -87,6 +87,11 @@ int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
 	return -EINVAL;
 }
 
+unsigned long strtoul(const char *cp, char **endp, unsigned int base)
+{
+	return simple_strtoul(cp, endp, base);
+}
+
 long simple_strtol(const char *cp,char **endp,unsigned int base)
 {
 	if(*cp=='-')
@@ -661,7 +666,7 @@ static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 		} else if (qualifier == 'Z' || qualifier == 'z') {
 			num = va_arg(args, size_t);
 		} else if (qualifier == 't') {
-			num = va_arg(args, ptrdiff_t);
+			num = va_arg(args, void *);
 		} else if (qualifier == 'h') {
 			num = (unsigned short) va_arg(args, int);
 			if (flags & SIGN)