diff --git a/src/vcl/ldp.c b/src/vcl/ldp.c
index 0dbc6a5..66c6d93 100644
--- a/src/vcl/ldp.c
+++ b/src/vcl/ldp.c
@@ -1814,8 +1814,8 @@
 		rv = -EFAULT;
 	      break;
 	    case TCP_CONGESTION:
-	      strcpy (optval, "cubic");
 	      *optlen = strlen ("cubic");
+	      strncpy (optval, "cubic", *optlen + 1);
 	      rv = 0;
 	      break;
 	    default: