diff --git a/src/iodine.c b/src/iodine.c
index f57be41..b21300b 100644
--- a/src/iodine.c
+++ b/src/iodine.c
@@ -781,6 +781,8 @@ handshake_autoprobe_fragsize(int dns_fd)
 					break;
 				}
 			}
+			fprintf(stderr, ".");
+			fflush(stderr);
 		}
 		range >>= 1;
 		if (max_fragsize == proposed_fragsize) {