diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 760cdb33a5d4..09dd0f7e0437 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -56,6 +56,9 @@
 
 	* include/experimental/string_view: Fix inconsistent exception specs.
 
+	* include/bits/shared_ptr.h (shared_ptr::shared_ptr(nullptr_t)):
+	Remove name of unused parameter.
+
 2014-04-14  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/stl_vector.h (_Vector_base::_Vector_impl,
diff --git a/libstdc++-v3/include/bits/shared_ptr.h b/libstdc++-v3/include/bits/shared_ptr.h
index 104c869ce303..290a0c983a39 100644
--- a/libstdc++-v3/include/bits/shared_ptr.h
+++ b/libstdc++-v3/include/bits/shared_ptr.h
@@ -262,7 +262,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  @param  __p  A null pointer constant.
        *  @post   use_count() == 0 && get() == nullptr
        */
-      constexpr shared_ptr(nullptr_t __p) noexcept : shared_ptr() { }
+      constexpr shared_ptr(nullptr_t) noexcept : shared_ptr() { }
 
       shared_ptr& operator=(const shared_ptr&) noexcept = default;