diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index a8b971b..391888b 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -401,6 +401,7 @@
 				SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
 
 		hci_le_start_enc(hcon, ediv, rand, stk);
+		hcon->enc_key_size = conn->smp_key_size;
 	} else {
 		u8 stk[16], r[16], rand[8];
 		__le16 ediv;
@@ -417,7 +418,8 @@
 		memset(stk + conn->smp_key_size, 0,
 				SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
 
-		hci_add_ltk(conn->hcon->hdev, 0, conn->dst, ediv, rand, stk);
+		hci_add_ltk(conn->hcon->hdev, 0, conn->dst, conn->smp_key_size,
+							ediv, rand, stk);
 	}
 
 	return 0;
@@ -487,6 +489,8 @@
 
 			hci_le_start_enc(hcon, master->ediv, master->rand,
 								key->val);
+			hcon->enc_key_size = key->pin_len;
+
 			goto done;
 		}
 
@@ -528,8 +532,8 @@
 
 	skb_pull(skb, sizeof(*rp));
 
-	hci_add_ltk(conn->hcon->hdev, 1, conn->src, rp->ediv,
-						rp->rand, conn->tk);
+	hci_add_ltk(conn->hcon->hdev, 1, conn->src, conn->smp_key_size,
+						rp->ediv, rp->rand, conn->tk);
 
 	smp_distribute_keys(conn, 1);
 
@@ -654,8 +658,8 @@
 
 		smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
 
-		hci_add_ltk(conn->hcon->hdev, 1, conn->dst, ediv,
-							ident.rand, enc.ltk);
+		hci_add_ltk(conn->hcon->hdev, 1, conn->dst, conn->smp_key_size,
+						ediv, ident.rand, enc.ltk);
 
 		ident.ediv = cpu_to_le16(ediv);