diff --git a/src/corelib/global/qflags.h b/src/corelib/global/qflags.h
index f85fc705b4..b871c90c9d 100644
--- a/src/corelib/global/qflags.h
+++ b/src/corelib/global/qflags.h
@@ -103,7 +103,7 @@ public:
     typedef int Int;
 #else
     typedef typename std::conditional<
-            QtPrivate::is_unsigned<Enum>::value,
+            QtPrivate::QIsUnsignedEnum<Enum>::value,
             unsigned int,
             signed int
         >::type Int;
diff --git a/src/corelib/global/qtypetraits.h b/src/corelib/global/qtypetraits.h
index b664dd3a3e..9773db919b 100644
--- a/src/corelib/global/qtypetraits.h
+++ b/src/corelib/global/qtypetraits.h
@@ -47,7 +47,8 @@ QT_BEGIN_NAMESPACE
 namespace QtPrivate {
 
 //
-// define custom is_signed, is_unsigned that also works with enum's
+// Define QIsUnsignedEnum, QIsSignedEnum -
+// std::is_signed, std::is_unsigned does not work for enum's
 //
 
 // a metafunction to invert an integral_constant:
@@ -57,37 +58,37 @@ struct not_
 
 // Checks whether a type is unsigned (T must be convertible to unsigned int):
 template <typename T>
-struct is_unsigned
+struct QIsUnsignedEnum
     : std::integral_constant<bool, (T(0) < T(-1))> {};
 
 // Checks whether a type is signed (T must be convertible to int):
 template <typename T>
-struct is_signed
-    : not_< is_unsigned<T> > {};
+struct QIsSignedEnum
+    : not_< QIsUnsignedEnum<T> > {};
 
-Q_STATIC_ASSERT(( is_unsigned<quint8>::value));
-Q_STATIC_ASSERT((!is_unsigned<qint8>::value));
+Q_STATIC_ASSERT(( QIsUnsignedEnum<quint8>::value));
+Q_STATIC_ASSERT((!QIsUnsignedEnum<qint8>::value));
 
-Q_STATIC_ASSERT((!is_signed<quint8>::value));
-Q_STATIC_ASSERT(( is_signed<qint8>::value));
+Q_STATIC_ASSERT((!QIsSignedEnum<quint8>::value));
+Q_STATIC_ASSERT(( QIsSignedEnum<qint8>::value));
 
-Q_STATIC_ASSERT(( is_unsigned<quint16>::value));
-Q_STATIC_ASSERT((!is_unsigned<qint16>::value));
+Q_STATIC_ASSERT(( QIsUnsignedEnum<quint16>::value));
+Q_STATIC_ASSERT((!QIsUnsignedEnum<qint16>::value));
 
-Q_STATIC_ASSERT((!is_signed<quint16>::value));
-Q_STATIC_ASSERT(( is_signed<qint16>::value));
+Q_STATIC_ASSERT((!QIsSignedEnum<quint16>::value));
+Q_STATIC_ASSERT(( QIsSignedEnum<qint16>::value));
 
-Q_STATIC_ASSERT(( is_unsigned<quint32>::value));
-Q_STATIC_ASSERT((!is_unsigned<qint32>::value));
+Q_STATIC_ASSERT(( QIsUnsignedEnum<quint32>::value));
+Q_STATIC_ASSERT((!QIsUnsignedEnum<qint32>::value));
 
-Q_STATIC_ASSERT((!is_signed<quint32>::value));
-Q_STATIC_ASSERT(( is_signed<qint32>::value));
+Q_STATIC_ASSERT((!QIsSignedEnum<quint32>::value));
+Q_STATIC_ASSERT(( QIsSignedEnum<qint32>::value));
 
-Q_STATIC_ASSERT(( is_unsigned<quint64>::value));
-Q_STATIC_ASSERT((!is_unsigned<qint64>::value));
+Q_STATIC_ASSERT(( QIsUnsignedEnum<quint64>::value));
+Q_STATIC_ASSERT((!QIsUnsignedEnum<qint64>::value));
 
-Q_STATIC_ASSERT((!is_signed<quint64>::value));
-Q_STATIC_ASSERT(( is_signed<qint64>::value));
+Q_STATIC_ASSERT((!QIsSignedEnum<quint64>::value));
+Q_STATIC_ASSERT(( QIsSignedEnum<qint64>::value));
 
 } // namespace QtPrivate
 
diff --git a/tests/auto/corelib/global/qflags/tst_qflags.cpp b/tests/auto/corelib/global/qflags/tst_qflags.cpp
index 10902b6f55..634d9a2df3 100644
--- a/tests/auto/corelib/global/qflags/tst_qflags.cpp
+++ b/tests/auto/corelib/global/qflags/tst_qflags.cpp
@@ -134,11 +134,11 @@ void tst_QFlags::signedness()
     // underlying type is implementation-defined, we need to allow for
     // a different signedness, so we only check that the relative
     // signedness of the types matches:
-    Q_STATIC_ASSERT((QtPrivate::is_unsigned<Qt::MouseButton>::value ==
-                     QtPrivate::is_unsigned<Qt::MouseButtons::Int>::value));
+    Q_STATIC_ASSERT((QtPrivate::QIsUnsignedEnum<Qt::MouseButton>::value ==
+                     QtPrivate::QIsUnsignedEnum<Qt::MouseButtons::Int>::value));
 
-    Q_STATIC_ASSERT((QtPrivate::is_signed<Qt::AlignmentFlag>::value ==
-                     QtPrivate::is_signed<Qt::Alignment::Int>::value));
+    Q_STATIC_ASSERT((QtPrivate::QIsSignedEnum<Qt::AlignmentFlag>::value ==
+                     QtPrivate::QIsSignedEnum<Qt::Alignment::Int>::value));
 }
 
 #if defined(Q_COMPILER_CLASS_ENUM)