@@ -14,10 +14,12 @@
  * file.
  */
 
 #import "OFObject.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*! @file */
 
 #ifdef OF_HAVE_BLOCKS
 /*!
  * @brief A block for a job which should be executed in a thread pool.
@@ -93,11 +95,11 @@
  * @param selector The selector to perform on the target
  * @param object THe object with which the selector is performed on the target
  */
 - (void)dispatchWithTarget: (id)target
 		  selector: (SEL)selector
-		    object: (id)object;
+		    object: (nullable id)object;
 
 #ifdef OF_HAVE_BLOCKS
 /*!
  * @brief Executes the specified block as soon as a thread is ready.
  *
@@ -116,5 +118,7 @@
  *
  * @return The size of the thread pool
  */
 - (size_t)size;
 @end
+
+OF_ASSUME_NONNULL_END