@@ -26,10 +26,11 @@
 /*!
  * @class OFCondition OFCondition.h ObjFW/OFCondition.h
  *
  * @brief A class implementing a condition variable for thread synchronization.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFCondition: OFMutex
 {
 	of_condition_t _condition;
 	bool _conditionInitialized;
 }