diff --git a/components/esp-tls/esp_tls_mbedtls.c b/components/esp-tls/esp_tls_mbedtls.c
index 9168012f452..7aec64a651e 100644
--- a/components/esp-tls/esp_tls_mbedtls.c
+++ b/components/esp-tls/esp_tls_mbedtls.c
@@ -973,8 +973,8 @@ static esp_err_t esp_set_atecc608a_pki_context(esp_tls_t *tls, const void *pki)
     }
     mbedtls_x509_crt_init(&tls->clientcert);
 
-    if(cfg->clientcert_buf != NULL) {
-        ret = mbedtls_x509_crt_parse(&tls->clientcert, (const unsigned char*)((esp_tls_pki_t *)pki->publiccert_pem_buf), (esp_tls_pki_t *)pki->publiccert_pem_bytes);
+    if (((esp_tls_pki_t *)pki)->publiccert_pem_buf != NULL) {
+        ret = mbedtls_x509_crt_parse(&tls->clientcert, (const unsigned char*)(((esp_tls_pki_t *) pki)->publiccert_pem_buf), ((esp_tls_pki_t *)pki)->publiccert_pem_bytes);
         if (ret < 0) {
             ESP_LOGE(TAG, "mbedtls_x509_crt_parse of client cert returned -0x%04X", -ret);
             mbedtls_print_error_msg(ret);