diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 1321074..4965e17 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -125,6 +125,11 @@
 #error "MBEDTLS_ECP_RESTARTABLE defined, but not MBEDTLS_ECDH_LEGACY_CONTEXT"
 #endif
 
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)           && \
+    defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
+#error "MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED defined, but MBEDTLS_ECDH_LEGACY_CONTEXT not disabled"
+#endif
+
 #if defined(MBEDTLS_ECDSA_DETERMINISTIC) && !defined(MBEDTLS_HMAC_DRBG_C)
 #error "MBEDTLS_ECDSA_DETERMINISTIC defined, but not all prerequisites"
 #endif