diff --git a/usbblaster_spi.c b/usbblaster_spi.c
index 58a8a0e..8059840 100644
--- a/usbblaster_spi.c
+++ b/usbblaster_spi.c
@@ -76,7 +76,7 @@
 /* Returns 0 upon success, a negative number upon errors. */
 int usbblaster_spi_init(void)
 {
-	uint8_t buf[BUF_SIZE + 1];
+	uint8_t buf[BUF_SIZE + 1] = { 0 };
 
 	if (ftdi_init(&ftdic) < 0)
 		return -1;
@@ -102,7 +102,6 @@
 		return -1;
 	}
 
-	memset(buf, 0, sizeof(buf));
 	buf[sizeof(buf)-1] = BIT_LED | BIT_CS;
 	if (ftdi_write_data(&ftdic, buf, sizeof(buf)) < 0) {
 		msg_perr("USB-Blaster reset write failed\n");
@@ -119,9 +118,8 @@
 
 static int send_write(unsigned int writecnt, const unsigned char *writearr)
 {
-	uint8_t buf[BUF_SIZE];
+	uint8_t buf[BUF_SIZE] = { 0 };
 
-	memset(buf, 0, sizeof(buf));
 	while (writecnt) {
 		unsigned int i;
 		unsigned int n_write = min(writecnt, BUF_SIZE - 1);
@@ -146,8 +144,7 @@
 {
 	int i;
 	unsigned int n_read;
-	uint8_t buf[BUF_SIZE];
-	memset(buf, 0, sizeof(buf));
+	uint8_t buf[BUF_SIZE] = { 0 };
 
 	n_read = readcnt;
 	while (n_read) {