diff --git a/CocoaTouch/src/BTstackManager.m b/CocoaTouch/src/BTstackManager.m
index fd8fe19e6..66904298a 100644
--- a/CocoaTouch/src/BTstackManager.m
+++ b/CocoaTouch/src/BTstackManager.m
@@ -66,7 +66,7 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packe
 	
 	// delegate and listener
 	_delegate = nil;
-	[self setListeners:[[NSMutableArray alloc] init]];
+	[self setListeners:[[NSMutableSet alloc] init]];
 	
 	// Use Cocoa run loop
 	run_loop_init(RUN_LOOP_COCOA);