diff --git a/plugins/keysend.c b/plugins/keysend.c
index 24743389d..ef6533440 100644
--- a/plugins/keysend.c
+++ b/plugins/keysend.c
@@ -171,13 +171,19 @@ static struct command_result *json_keysend(struct command *cmd, const char *buf,
 	p->deadline = timeabs_add(time_now(), time_from_sec(*retryfor));
 	p->getroute->riskfactorppm = 10000000;
 
+	if (node_id_eq(&my_id, p->destination)) {
+		return command_fail(
+		    cmd, JSONRPC2_INVALID_PARAMS,
+		    "We are the destination. Keysend cannot be used to send funds to yourself");
+	}
+
 	if (!amount_msat_fee(&p->constraints.fee_budget, p->amount, 0,
 			     *maxfee_pct_millionths / 100)) {
-		tal_free(p);
 		return command_fail(
 		    cmd, JSONRPC2_INVALID_PARAMS,
 		    "Overflow when computing fee budget, fee rate too high.");
 	}
+
 	p->constraints.cltv_budget = *maxdelay;
 
 	payment_mod_exemptfee_get_data(p)->amount = *exemptfee;
diff --git a/tests/test_pay.py b/tests/test_pay.py
index 6dfd92b4e..356b5f7aa 100644
--- a/tests/test_pay.py
+++ b/tests/test_pay.py
@@ -3030,6 +3030,10 @@ def test_keysend(node_factory):
     features = l1.rpc.listnodes(l4.info['id'])['nodes'][0]['features']
     assert(int(features, 16) >> 55 & 0x01 == 0)
 
+    # Self-sends are not allowed (see #4438)
+    with pytest.raises(RpcError, match=r'We are the destination.'):
+        l1.rpc.keysend(l1.info['id'], amt)
+
     # Send an indirect one from l1 to l3
     l1.rpc.keysend(l3.info['id'], amt)
     invs = l3.rpc.listinvoices()['invoices']