diff --git a/Include/pyatomic.h b/Include/pyatomic.h
index da45327b89c..d4e19e0070b 100644
--- a/Include/pyatomic.h
+++ b/Include/pyatomic.h
@@ -58,6 +58,7 @@ _Py_atomic_thread_fence(_Py_memory_order order)
 static __inline__ void
 _Py_ANNOTATE_MEMORY_ORDER(const volatile void *address, _Py_memory_order order)
 {
+    (void)address;		/* shut up -Wunused-parameter */
     switch(order) {
     case _Py_memory_order_release:
     case _Py_memory_order_acq_rel:
diff --git a/Misc/NEWS b/Misc/NEWS
index fbf18ccd919..f941c63128f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@ What's New in Python 3.3 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #11147: Fix an unused argument in _Py_ANNOTATE_MEMORY_ORDER.  (Fix
+  given by Campbell Barton).
+
 - Issue #13503: Use a more efficient reduction format for bytearrays with
   pickle protocol >= 3.  The old reduction format is kept with older protocols
   in order to allow unpickling under Python 2.  Patch by Irmen de Jong.