diff --git a/src/connector.c b/src/connector.c
index 44dbc76d..ed68155d 100644
--- a/src/connector.c
+++ b/src/connector.c
@@ -274,11 +274,14 @@ static int drop_client(cdata_t *cdata, client_instance_t *client)
 	return fd;
 }
 
-static void stratifier_drop_client(ckpool_t *ckp, int64_t id)
+static void stratifier_drop_client(ckpool_t *ckp, const client_instance_t *client)
 {
 	char buf[256];
 
-	sprintf(buf, "dropclient=%"PRId64, id);
+	/* The stratifier is not in use in passthrough mode */
+	if (ckp->passthrough || client->passthrough)
+		return;
+	sprintf(buf, "dropclient=%"PRId64, client->id);
 	send_proc(ckp->stratifier, buf);
 }
 
@@ -292,9 +295,7 @@ static int invalidate_client(ckpool_t *ckp, cdata_t *cdata, client_instance_t *c
 	int ret;
 
 	ret = drop_client(cdata, client);
-	if (ckp->passthrough)
-		goto out;
-	stratifier_drop_client(ckp, client->id);
+	stratifier_drop_client(ckp, client);
 
 	/* Cull old unused clients lazily when there are no more reference
 	 * counts for them. */
@@ -308,7 +309,6 @@ static int invalidate_client(ckpool_t *ckp, cdata_t *cdata, client_instance_t *c
 	}
 	ck_wunlock(&cdata->lock);
 
-out:
 	return ret;
 }
 
diff --git a/src/stratifier.c b/src/stratifier.c
index 25f9cdd5..5d483fcb 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -3409,14 +3409,14 @@ static void parse_method(sdata_t *sdata, stratum_instance_t *client, const int64
 	}
 
 	if (unlikely(cmdmatch(method, "mining.passthrough"))) {
-		LOGNOTICE("Adding passthrough client %"PRId64" %s", client_id, client->address);
 		/* We need to inform the connector process that this client
-		 * is a passthrough and to manage its messages accordingly.
-		 * The client_id stays on the list but we won't send anything
-		 * to it since it's unauthorised. Set the flag just in case. */
-		client->authorised = false;
+		 * is a passthrough and to manage its messages accordingly. No
+		 * data from this client id should ever come back to this
+		 * stratifier after this so drop the client in the stratifier. */
+		LOGNOTICE("Adding passthrough client %"PRId64" %s", client_id, client->address);
 		snprintf(buf, 255, "passthrough=%"PRId64, client_id);
 		send_proc(client->ckp->connector, buf);
+		drop_client(sdata, client_id);
 		return;
 	}