diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index c344310a2c3..fcb54b0029c 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2017-04-03  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/20_util/reference_wrapper/invoke.cc: Uncomment tests
+	that no longer fail.
+
 	* include/bits/ios_base.h: Correct comment.
 	* testsuite/util/testsuite_hooks.h: Likewise.
 
diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc
index 8fd5470639c..c4a45378a51 100644
--- a/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc
@@ -73,8 +73,7 @@ void test01()
   int (::X::* p_foo_c)(float) const = &::X::foo_c;
   int (::X::* p_foo_v)(float) volatile = &::X::foo_v;
   int (::X::* p_foo_cv)(float) const volatile = &::X::foo_cv;
-  int (::X::* p_foo_varargs)(float, ...) __attribute__((unused))
-    = &::X::foo_varargs;
+  int (::X::* p_foo_varargs)(float, ...) = &::X::foo_varargs;
   int ::X::* p_bar = &::X::bar;
 
   const float pi = 3.14;
@@ -96,10 +95,10 @@ void test01()
   VERIFY(ref(p_foo_v)(xp, pi) == 3);
   VERIFY(ref(p_foo_cv)(x, pi) == 3);
   VERIFY(ref(p_foo_cv)(xp, pi) == 3);
-  // VERIFY(ref(p_foo_varargs)(x, pi) == 3);
-  // VERIFY(ref(p_foo_varargs)(xp, pi, 1, 1) == 3);
-  // VERIFY(ref(p_foo_varargs)(x, pi, 1, 1) == 3);
-  // VERIFY(ref(p_foo_varargs)(xp, pi) == 3);
+  VERIFY(ref(p_foo_varargs)(x, pi) == 3);
+  VERIFY(ref(p_foo_varargs)(xp, pi, 1, 1) == 3);
+  VERIFY(ref(p_foo_varargs)(x, pi, 1, 1) == 3);
+  VERIFY(ref(p_foo_varargs)(xp, pi) == 3);
 
   // Member data pointers
   VERIFY(ref(p_bar)(x) == 17);