diff --git a/early_printk.c b/early_printk.c
index cb2f75e..90e2fac 100644
--- a/early_printk.c
+++ b/early_printk.c
@@ -14,11 +14,11 @@ static int early_serial_base = 0x3f8;  /* ttyS0 */
 static bool early_serial_txr_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
 {
 	char *p = data;
-	uint32_t i;
+	int i;
 
-	for (i = 0; i < count; i++) {
-		fprintf(stderr, "%c", *p);
-		p += size;
+	while (count--) {
+		for (i = 0; i < size; i++)
+			fprintf(stderr, "%c", *p++);
 	}
 	fflush(stderr);