diff --git a/nbd-proxy.c b/nbd-proxy.c
index f98feec..35f0ccd 100644
--- a/nbd-proxy.c
+++ b/nbd-proxy.c
@@ -99,7 +99,7 @@
 	}
 
 	addr.sun_family = AF_UNIX;
-	strncpy(addr.sun_path, path, sizeof(addr.sun_path));
+	strncpy(addr.sun_path, path, sizeof(addr.sun_path) -1);
 
 	rc = bind(sd, (struct sockaddr *)&addr, sizeof(addr));
 	if (rc) {