diff --git a/mesh/crypto.c b/mesh/crypto.c
index 668d168..3754cb0 100644
--- a/mesh/crypto.c
+++ b/mesh/crypto.c
@@ -251,9 +251,9 @@ bool mesh_crypto_nkbk(const uint8_t n[16], uint8_t beacon_key[16])
 	return crypto_128(n, "nkbk", beacon_key);
 }
 
-bool mesh_crypto_nkpk(const uint8_t n[16], uint8_t proxy_key[16])
+bool mesh_crypto_nkpk(const uint8_t n[16], uint8_t private_key[16])
 {
-	return crypto_128(n, "nkpk", proxy_key);
+	return crypto_128(n, "nkpk", private_key);
 }
 
 bool mesh_crypto_k3(const uint8_t n[16], uint8_t out64[8])
diff --git a/mesh/crypto.h b/mesh/crypto.h
index c31abbb..5578988 100644
--- a/mesh/crypto.h
+++ b/mesh/crypto.h
@@ -26,7 +26,7 @@ bool mesh_aes_ecb_one(const uint8_t key[16],
 			const uint8_t plaintext[16], uint8_t encrypted[16]);
 bool mesh_crypto_nkik(const uint8_t network_key[16], uint8_t identity_key[16]);
 bool mesh_crypto_nkbk(const uint8_t network_key[16], uint8_t beacon_key[16]);
-bool mesh_crypto_nkpk(const uint8_t network_key[16], uint8_t proxy_key[16]);
+bool mesh_crypto_nkpk(const uint8_t network_key[16], uint8_t private_key[16]);
 bool mesh_crypto_identity(const uint8_t net_key[16], uint16_t addr,
 							uint8_t id[16]);
 bool mesh_crypto_beacon_cmac(const uint8_t encryption_key[16],