diff --git a/libraries/ESP8266WiFi/src/BearSSLHelpers.h b/libraries/ESP8266WiFi/src/BearSSLHelpers.h
index 397a55752..3033a80ae 100644
--- a/libraries/ESP8266WiFi/src/BearSSLHelpers.h
+++ b/libraries/ESP8266WiFi/src/BearSSLHelpers.h
@@ -58,6 +58,7 @@ class PublicKey {
 
     // Disable the copy constructor, we're pointer based
     PublicKey(const PublicKey& that) = delete;
+    PublicKey& operator=(const PublicKey& that) = delete;
 
   private:
     brssl::public_key *_key;
@@ -86,6 +87,7 @@ class PrivateKey {
 
     // Disable the copy constructor, we're pointer based
     PrivateKey(const PrivateKey& that) = delete;
+    PrivateKey& operator=(const PrivateKey& that) = delete;
 
   private:
     brssl::private_key *_key;
@@ -122,6 +124,7 @@ class X509List {
 
     // Disable the copy constructor, we're pointer based
     X509List(const X509List& that) = delete;
+    X509List& operator=(const X509List& that) = delete;
 
   private:
     size_t _count;
diff --git a/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.h b/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.h
index 8a77648d9..afdb0c0a7 100644
--- a/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.h
+++ b/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.h
@@ -34,7 +34,7 @@ namespace BearSSL {
 class WiFiClientSecureCtx : public WiFiClient {
   public:
     WiFiClientSecureCtx();
-    WiFiClientSecureCtx(const WiFiClientSecure &rhs) = delete;
+    WiFiClientSecureCtx(const WiFiClientSecureCtx &rhs) = delete;
     ~WiFiClientSecureCtx() override;
 
     WiFiClientSecureCtx& operator=(const WiFiClientSecureCtx&) = delete;
@@ -43,7 +43,7 @@ class WiFiClientSecureCtx : public WiFiClient {
     // TODO: don't remove just yet to avoid including the WiFiClient default implementation and unintentionally causing
     //       a 'slice' that this method tries to avoid in the first place
     std::unique_ptr<WiFiClient> clone() const override {
-        return std::unique_ptr<WiFiClient>(new WiFiClientSecureCtx(*this));
+        return nullptr;
     }
 
     int connect(IPAddress ip, uint16_t port) override;