diff --git a/Source/GSNetServices.h b/Source/GSNetServices.h
index 6ec462a..83f1844 100644
--- a/Source/GSNetServices.h
+++ b/Source/GSNetServices.h
@@ -67,6 +67,7 @@ typedef enum
 NSString* GSNetServiceDotTerminatedNSStringFromString(const char* string);
 
 @class GSAvahiRunLoopContext, NSTimer, NSLock, NSRecursiveLock, NSMutableDictionary, NSMapTable;
address@hidden NSLocking;
 
 /**
  * NSNetService using the avahi-client API.
@@ -80,7 +81,7 @@ NSString* GSNetServiceDotTerminatedNSStringFromString(const char* string);
   NSRecursiveLock *_lock;
   // Ivars for this class:
   NSMutableDictionary *_info;
-  NSLock *_infoLock;
+  NSObject<NSLocking> *_infoLock;
   NSUInteger _infoSeq;
   GSNetServiceState _serviceState;
   int _ifIndex;