diff --git a/src/jtag/drivers/stlink_usb.c b/src/jtag/drivers/stlink_usb.c
index 1a3cc6154..a9ee44d92 100644
--- a/src/jtag/drivers/stlink_usb.c
+++ b/src/jtag/drivers/stlink_usb.c
@@ -1002,7 +1002,7 @@ static int stlink_usb_version(void *handle)
 	if (bridge)
 		p += sprintf(p, "B%d", bridge);
 	if (swim || !msd)
-		p += sprintf(p, "S%d", swim);
+		sprintf(p, "S%d", swim);
 
 	LOG_INFO("STLINK %s (API v%d) VID:PID %04X:%04X",
 		v_str,