diff --git a/components/esp-tls/esp_tls.h b/components/esp-tls/esp_tls.h
index f52eb3b79..a5983b2e3 100644
--- a/components/esp-tls/esp_tls.h
+++ b/components/esp-tls/esp_tls.h
@@ -197,7 +197,7 @@ typedef struct esp_tls_cfg {
                                                  then PSK authentication is enabled with configured setup.
                                                  Important note: the pointer must be valid for connection */
 
-    esp_err_t (*crt_bundle_attach)(mbedtls_ssl_config *conf);
+    esp_err_t (*crt_bundle_attach)(void *conf);
                                             /*!< Function pointer to esp_crt_bundle_attach. Enables the use of certification
                                                  bundle for server verification, must be enabled in menuconfig */
 
diff --git a/components/mbedtls/esp_crt_bundle/esp_crt_bundle.c b/components/mbedtls/esp_crt_bundle/esp_crt_bundle.c
index b4019e5dd..6d99f781c 100644
--- a/components/mbedtls/esp_crt_bundle/esp_crt_bundle.c
+++ b/components/mbedtls/esp_crt_bundle/esp_crt_bundle.c
@@ -176,7 +176,7 @@ static esp_err_t esp_crt_bundle_init(const uint8_t *x509_bundle)
     return ESP_OK;
 }
 
-esp_err_t esp_crt_bundle_attach(mbedtls_ssl_config *conf)
+esp_err_t esp_crt_bundle_attach(void *conf)
 {
     esp_err_t ret = ESP_OK;
     // If no bundle has been set by the user then use the bundle embedded in the binary
@@ -195,8 +195,8 @@ esp_err_t esp_crt_bundle_attach(mbedtls_ssl_config *conf)
          * cacert_ptr passes non-NULL check during handshake
          */
         mbedtls_x509_crt_init(&s_dummy_crt);
-        conf->ca_chain = &s_dummy_crt;
-        mbedtls_ssl_conf_verify(conf, esp_crt_verify_callback, NULL);
+        ((mbedtls_ssl_config *)conf)->ca_chain = &s_dummy_crt;
+        mbedtls_ssl_conf_verify((mbedtls_ssl_config *)conf, esp_crt_verify_callback, NULL);
     }
 
     return ret;
diff --git a/components/mbedtls/esp_crt_bundle/include/esp_crt_bundle.h b/components/mbedtls/esp_crt_bundle/include/esp_crt_bundle.h
index a3a691ce5..38fff5463 100644
--- a/components/mbedtls/esp_crt_bundle/include/esp_crt_bundle.h
+++ b/components/mbedtls/esp_crt_bundle/include/esp_crt_bundle.h
@@ -36,7 +36,7 @@ extern "C" {
  *             - ESP_OK  if adding certificates was successful.
  *             - Other   if an error occured or an action must be taken by the calling process.
  */
-esp_err_t esp_crt_bundle_attach(mbedtls_ssl_config *conf);
+esp_err_t esp_crt_bundle_attach(void *conf);
 
 
 /**
@@ -64,4 +64,4 @@ void esp_crt_bundle_set(const uint8_t *x509_bundle);
 }
 #endif
 
-#endif //_ESP_CRT_BUNDLE_H_
\ No newline at end of file
+#endif //_ESP_CRT_BUNDLE_H_