diff --git a/doc/global/qt-cpp-defines.qdocconf b/doc/global/qt-cpp-defines.qdocconf
index 4dbe144913f..13533555c50 100644
--- a/doc/global/qt-cpp-defines.qdocconf
+++ b/doc/global/qt-cpp-defines.qdocconf
@@ -13,7 +13,6 @@ defines                 += Q_QDOC \
                           QT_DEPRECATED \
                           QT_DEPRECATED_* \
                           Q_NO_USING_KEYWORD \
-                          __cplusplus \
                           Q_OS_.* \
                           Q_STDLIB_UNICODE_STRINGS \
                           Q_COMPILER_INITIALIZER_LISTS \
@@ -21,8 +20,7 @@ defines                 += Q_QDOC \
                           Q_COMPILER_UNIFORM_INIT \
                           Q_COMPILER_RVALUE_REFS
 
-clangdefines            += __cplusplus \
-                           Q_QDOC \
+clangdefines            += Q_QDOC \
                            Q_CLANG_QDOC \
                            QT_COMPAT \
                            QT3_SUPPORT \