diff --git a/src/network/ssl/qdtls_openssl.cpp b/src/network/ssl/qdtls_openssl.cpp
index 80b5179f69..fe6c8013c7 100644
--- a/src/network/ssl/qdtls_openssl.cpp
+++ b/src/network/ssl/qdtls_openssl.cpp
@@ -1273,7 +1273,7 @@ unsigned QDtlsPrivateOpenSSL::pskClientCallback(const char *hint, char *identity
         }
 
         QTlsBackend::setupClientPskAuth(&authenticator, hint ? identityHint.constData() : nullptr,
-                                        hint ? std::strlen(hint) : 0, max_identity_len, max_psk_len);
+                                        hint ? int(std::strlen(hint)) : 0, max_identity_len, max_psk_len);
         pskAuthenticator.swap(authenticator);
     }
 
diff --git a/src/network/ssl/qdtls_openssl_p.h b/src/network/ssl/qdtls_openssl_p.h
index 6e9e59cbd2..281e1133cd 100644
--- a/src/network/ssl/qdtls_openssl_p.h
+++ b/src/network/ssl/qdtls_openssl_p.h
@@ -58,6 +58,7 @@
 #include <QtNetwork/qhostaddress.h>
 
 #include <QtCore/qbytearray.h>
+#include <QtCore/qglobal.h>
 #include <QtCore/qlist.h>
 #include <QtCore/qsharedpointer.h>
 
@@ -134,6 +135,13 @@ private:
 
 } // namespace dtlsopenssl
 
+// The trick with 'right' ancestor in the tree overriding (only once) some shared
+// virtual functions is intentional. Too bad MSVC warns me about ... exactly the
+// feature of C++ that I want to use.
+
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_MSVC(4250)
+
 class QDtlsClientVerifierOpenSSL : public QTlsPrivate::DtlsCookieVerifier, public QDtlsBasePrivate
 {
 public:
@@ -236,6 +244,8 @@ private:
     QByteArray identityHint;
 };
 
+QT_WARNING_POP // C4250
+
 QT_END_NAMESPACE
 
 #endif // QDTLS_OPENSSL_P_H