diff --git a/include/future b/include/future
index a7c28a4..536574e 100644
--- a/include/future
+++ b/include/future
@@ -2021,7 +2021,7 @@
               class = typename enable_if
               <
                   !is_same<
-                      typename decay<_Fp>::type, 
+                      typename __uncvref<_Fp>::type, 
                       packaged_task
                       >::value
                   >::type
@@ -2032,7 +2032,7 @@
               class = typename enable_if
               <
                   !is_same<
-                      typename decay<_Fp>::type, 
+                      typename __uncvref<_Fp>::type, 
                       packaged_task
                       >::value
                   >::type
@@ -2150,7 +2150,7 @@
               class = typename enable_if
               <
                   !is_same<
-                      typename decay<_Fp>::type, 
+                      typename __uncvref<_Fp>::type, 
                       packaged_task
                       >::value
                   >::type
@@ -2161,7 +2161,7 @@
               class = typename enable_if
               <
                   !is_same<
-                      typename decay<_Fp>::type, 
+                      typename __uncvref<_Fp>::type, 
                       packaged_task
                       >::value
                   >::type
diff --git a/include/thread b/include/thread
index 1b8dca3..0629d70 100644
--- a/include/thread
+++ b/include/thread
@@ -298,7 +298,7 @@
     template <class _Fp, class ..._Args,
               class = typename enable_if
               <
-                   !is_same<typename decay<_Fp>::type, thread>::value
+                   !is_same<typename __uncvref<_Fp>::type, thread>::value
               >::type
              >
         _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS