diff --git a/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp b/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
index 57d4a3834..179e5e762 100644
--- a/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
+++ b/test/std/iterators/iterator.primitives/iterator.traits/empty.pass.cpp
@@ -25,8 +25,8 @@ struct has_value_type
 {
 private:
     struct two {char lx; char lxx;};
-    template <class _Up> static two test(...);
-    template <class _Up> static char test(typename _Up::value_type* = 0);
+    template <class U> static two test(...);
+    template <class U> static char test(typename U::value_type* = 0);
 public:
     static const bool value = sizeof(test<T>(0)) == 1;
 };
diff --git a/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp b/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
index 19de6f7f0..fce826f42 100644
--- a/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/arithmetic.operations/transparent.pass.cpp
@@ -15,11 +15,11 @@ template <class T>
 struct is_transparent
 {
 private:
-    struct __two {char __lx; char __lxx;};
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+    struct two {char lx; char lxx;};
+    template <class U> static two test(...);
+    template <class U> static char test(typename U::is_transparent* = 0);
 public:
-    static const bool value = sizeof(__test<T>(0)) == 1;
+    static const bool value = sizeof(test<T>(0)) == 1;
 };
 
 
diff --git a/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp b/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
index 0b9796027..bcd353eba 100644
--- a/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/bitwise.operations/transparent.pass.cpp
@@ -15,11 +15,11 @@ template <class T>
 struct is_transparent
 {
 private:
-    struct __two {char __lx; char __lxx;};
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+    struct two {char lx; char lxx;};
+    template <class U> static two test(...);
+    template <class U> static char test(typename U::is_transparent* = 0);
 public:
-    static const bool value = sizeof(__test<T>(0)) == 1;
+    static const bool value = sizeof(test<T>(0)) == 1;
 };
 
 
diff --git a/test/std/utilities/function.objects/comparisons/transparent.pass.cpp b/test/std/utilities/function.objects/comparisons/transparent.pass.cpp
index 40b0f5e07..ebae262b2 100644
--- a/test/std/utilities/function.objects/comparisons/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/comparisons/transparent.pass.cpp
@@ -15,11 +15,11 @@ template <class T>
 struct is_transparent
 {
 private:
-    struct __two {char __lx; char __lxx;};
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+    struct two {char lx; char lxx;};
+    template <class U> static two test(...);
+    template <class U> static char test(typename U::is_transparent* = 0);
 public:
-    static const bool value = sizeof(__test<T>(0)) == 1;
+    static const bool value = sizeof(test<T>(0)) == 1;
 };
 
 
diff --git a/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp b/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp
index b915863f2..d64c02f97 100644
--- a/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp
+++ b/test/std/utilities/function.objects/logical.operations/transparent.pass.cpp
@@ -15,11 +15,11 @@ template <class T>
 struct is_transparent
 {
 private:
-    struct __two {char __lx; char __lxx;};
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
+    struct two {char lx; char lxx;};
+    template <class U> static two test(...);
+    template <class U> static char test(typename U::is_transparent* = 0);
 public:
-    static const bool value = sizeof(__test<T>(0)) == 1;
+    static const bool value = sizeof(test<T>(0)) == 1;
 };