diff --git a/library/pk_internal.h b/library/pk_internal.h
index 9989363..67ee5fe 100644
--- a/library/pk_internal.h
+++ b/library/pk_internal.h
@@ -112,9 +112,9 @@
 }
 
 /* Helper for Montgomery curves */
-#if defined(MBEDTLS_HAVE_CURVE25519) || defined(MBEDTLS_HAVE_CURVE448)
+#if defined(MBEDTLS_ECP_HAVE_CURVE25519) || defined(MBEDTLS_ECP_HAVE_CURVE448)
 #define MBEDTLS_PK_HAVE_RFC8410_CURVES
-#endif /* MBEDTLS_HAVE_CURVE25519 || MBEDTLS_ECP_DP_CURVE448 */
+#endif /* MBEDTLS_ECP_HAVE_CURVE25519 || MBEDTLS_ECP_DP_CURVE448 */
 #endif /* MBEDTLS_PK_HAVE_ECC_KEYS */