diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
index f3d5d79f1cd15de8dff66fa4aeab6fccaa25ab8e..69c26f04d8ce06aa0b74b944e12ed282e618e7fb 100644
--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
@@ -574,6 +574,7 @@ myri10ge_validate_firmware(struct myri10ge_priv *mgp,
 
 	/* save firmware version for ethtool */
 	strncpy(mgp->fw_version, hdr->version, sizeof(mgp->fw_version));
+	mgp->fw_version[sizeof(mgp->fw_version) - 1] = '\0';
 
 	sscanf(mgp->fw_version, "%d.%d.%d", &mgp->fw_ver_major,
 	       &mgp->fw_ver_minor, &mgp->fw_ver_tiny);