Index: src/OFRunLoop.m
==================================================================
--- src/OFRunLoop.m
+++ src/OFRunLoop.m
@@ -602,11 +602,13 @@
 		void *pool;
 		OFDate *now;
 		OFTimer *timer;
 		OFDate *nextTimer;
 
+#ifdef OF_HAVE_THREADS
 		of_memory_read_barrier();
+#endif
 		if (!_running)
 			break;
 
 		pool = objc_autoreleasePoolPush();
 		now = [OFDate date];
@@ -669,9 +671,11 @@
 }
 
 - (void)stop
 {
 	_running = false;
+#ifdef OF_HAVE_THREADS
 	of_memory_write_barrier();
+#endif
 	[_streamObserver cancel];
 }
 @end