diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index e1aae8038f0f..b554c0599a09 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,7 @@
 2015-05-01  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/experimental/memory: Correct feature-test macro.
+
 	* include/experimental/memory: Add feature-test macro.
 	* include/experimental/vector: Likewise.
 	* doc/xml/manual/status_cxx2017.xml: Update status.
diff --git a/libstdc++-v3/include/experimental/memory b/libstdc++-v3/include/experimental/memory
index f43621f53c52..08a6b33c7c10 100644
--- a/libstdc++-v3/include/experimental/memory
+++ b/libstdc++-v3/include/experimental/memory
@@ -52,7 +52,7 @@ inline namespace fundamentals_v2
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
-#define __cpp_lib_experimental_not_fn 201411
+#define __cpp_lib_experimental_observer_ptr 201411
 
   template <typename _Tp>
     class observer_ptr