diff --git a/src/atomic_ptr.hpp b/src/atomic_ptr.hpp
index f7113adc..affdf63e 100644
--- a/src/atomic_ptr.hpp
+++ b/src/atomic_ptr.hpp
@@ -284,11 +284,7 @@ struct atomic_value_t
 #endif
 
 #if defined ZMQ_ATOMIC_PTR_MUTEX
-#if defined ZMQ_HAVE_VXWORKS
     mutable mutex_t sync;
-#else
-    mutex_t sync;
-#endif
 #endif
 
   private: