@@ -55,11 +55,12 @@
  */
 @protocol OFTLSSocket
 /*!
  * The delegate for the TLS socket.
  */
-@property OF_NULLABLE_PROPERTY (assign) id <OFTLSSocketDelegate> delegate;
+@property OF_NULLABLE_PROPERTY (nonatomic, assign)
+    id <OFTLSSocketDelegate> delegate;
 
 /*!
  * The path to the X.509 certificate file to use.
  */
 @property OF_NULLABLE_PROPERTY (nonatomic, copy) OFString *certificateFile;
@@ -73,18 +74,19 @@
  * The passphrase to decrypt the PKCS#8 private key file.
  *
  * @warning You have to ensure that this is in secure memory protected from
  *	    swapping! This is also the reason why this is not an OFString.
  */
-@property OF_NULLABLE_PROPERTY (assign) const char *privateKeyPassphrase;
+@property OF_NULLABLE_PROPERTY (nonatomic, assign)
+    const char *privateKeyPassphrase;
 
 /**
  * Whether certificate verification is enabled.
  *
  * The default is enabled.
  */
-@property (getter=isCertificateVerificationEnabled)
+@property (nonatomic, getter=isCertificateVerificationEnabled)
     bool certificateVerificationEnabled;
 
 /*!
  * @brief Initializes the TLS socket with the specified TCP socket as its
  *	  underlying socket.