@@ -171,11 +171,12 @@
  */
 - initWithProgram: (OFString *)program
       programName: (OFString *)programName
 	arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments
       environment: (nullable OFDictionary
-		       OF_GENERIC(OFString *, OFString *) *)environment;
+		       OF_GENERIC(OFString *, OFString *) *)environment
+    OF_DESIGNATED_INITIALIZER;
 
 /*!
  * @brief Closes the write direction of the process.
  *
  * This method needs to be called for some programs before data can be read,