diff --git a/library/psa_crypto_ecp.h b/library/psa_crypto_ecp.h
index 429c062..5a7f6f2 100644
--- a/library/psa_crypto_ecp.h
+++ b/library/psa_crypto_ecp.h
@@ -218,4 +218,11 @@
     const uint8_t *key_buffer, size_t key_buffer_size,
     psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
     const uint8_t *signature, size_t signature_length );
+
+psa_status_t mbedtls_psa_key_agreement_ecdh( 
+    const psa_key_attributes_t *attributes,
+    const uint8_t *key_buffer, size_t key_buffer_size,
+    psa_algorithm_t alg, const uint8_t *peer_key, size_t peer_key_length,
+    uint8_t *shared_secret, size_t shared_secret_size,
+    size_t *shared_secret_length );
 #endif /* PSA_CRYPTO_ECP_H */