diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index af68533baa2..03aaeca1af5 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2018-11-13  Jonathan Wakely  <jwakely@redhat.com>
 
+	* src/c++17/memory_resource.cc (_Pool::deallocate): Restore
+	attributes to parameters that are only used in assertions.
+
 	* src/c++17/memory_resource.cc (bitset::find_first_unset()): Remove
 	unused function.
 	(bitset::get_first_unset()): Remove loop, if there's are unset bits
diff --git a/libstdc++-v3/src/c++17/memory_resource.cc b/libstdc++-v3/src/c++17/memory_resource.cc
index b553606f552..cb91e5147ce 100644
--- a/libstdc++-v3/src/c++17/memory_resource.cc
+++ b/libstdc++-v3/src/c++17/memory_resource.cc
@@ -940,7 +940,8 @@ namespace pmr
   }
 
   void
-  __pool_resource::deallocate(void* p, size_t bytes, size_t alignment)
+  __pool_resource::deallocate(void* p, size_t bytes [[maybe_unused]],
+			      size_t alignment [[maybe_unused]])
   {
     const auto it
       = std::lower_bound(_M_unpooled.begin(), _M_unpooled.end(), p);