diff --git a/nsm.c b/nsm.c
index 0fb73fb..cefea5d 100644
--- a/nsm.c
+++ b/nsm.c
@@ -337,16 +337,17 @@ static struct ptp_message *nsm_recv(struct nsm *nsm, int fd)
 		case -EBADMSG:
 			pr_err("bad message");
 			break;
-		case -ETIME:
-			pr_err("received %s without timestamp",
-			       msg_type_string(msg_type(msg)));
-			break;
 		case -EPROTO:
 			pr_debug("ignoring message");
 			break;
 		}
 		goto failed;
 	}
+	if (msg_sots_missing(msg)) {
+		pr_err("received %s without timestamp",
+		       msg_type_string(msg_type(msg)));
+		goto failed;
+	}
 
 	return msg;
 failed:
diff --git a/pmc_common.c b/pmc_common.c
index d1eafe7..fcb9c8e 100644
--- a/pmc_common.c
+++ b/pmc_common.c
@@ -326,16 +326,17 @@ struct ptp_message *pmc_recv(struct pmc *pmc)
 		case -EBADMSG:
 			pr_err("bad message");
 			break;
-		case -ETIME:
-			pr_err("received %s without timestamp",
-					msg_type_string(msg_type(msg)));
-			break;
 		case -EPROTO:
 			pr_debug("ignoring message");
 			break;
 		}
 		goto failed;
 	}
+	if (msg_sots_missing(msg)) {
+		pr_err("received %s without timestamp",
+		       msg_type_string(msg_type(msg)));
+		goto failed;
+	}
 
 	return msg;
 failed: