Index: src/OFThread.m
==================================================================
--- src/OFThread.m
+++ src/OFThread.m
@@ -270,10 +270,17 @@
 {
 	if (running == OF_THREAD_RUNNING)
 		@throw [OFThreadStillRunningException newWithClass: isa
 							    thread: self];
 
+	/*
+	 * We should not be running anymore, but call detach in order to free
+	 * the resources.
+	 */
+	if (running == OF_THREAD_WAITING_FOR_JOIN)
+		of_thread_detach(thread);
+
 	[object release];
 	[retval release];
 
 	[super dealloc];
 }

Index: src/threading.h
==================================================================
--- src/threading.h
+++ src/threading.h
@@ -88,10 +88,21 @@
 	CloseHandle(thread);
 
 	return YES;
 #endif
 }
+
+static OF_INLINE BOOL
+of_thread_detach(of_thread_t thread)
+{
+#if defined(OF_HAVE_PTHREADS)
+	return !pthread_detach(thread);
+#elif defined(_WIN32)
+	/* FIXME */
+	return YES;
+#endif
+}
 
 static OF_INLINE void
 of_thread_exit()
 {
 #if defined(OF_HAVE_PTHREADS)