diff --git a/configure.in b/configure.in
index 1e6c788..f6cce4e 100644
--- a/configure.in
+++ b/configure.in
@@ -57,7 +57,7 @@ dnl KDE_USE_TQT
 AC_PATH_KDE
 #MIN_CONFIG
 AM_MAINTAINER_MODE
-CXXFLAGS="$CXXFLAGS -DQT_CLEAN_NAMESPACE  -DQT_NO_ASCII_CAST"
+CXXFLAGS="$CXXFLAGS  -DQT_NO_ASCII_CAST"
 KDE_CREATE_SUBDIRSLIST
 AM_CONDITIONAL(doc_SUBDIR_included, test "x$doc_SUBDIR_included" = xyes)
 AM_CONDITIONAL(kcpuload_SUBDIR_included, test "x$kcpuload_SUBDIR_included" = xyes)
diff --git a/configure.in.in b/configure.in.in
index 13e012f..26d5ee1 100644
--- a/configure.in.in
+++ b/configure.in.in
@@ -2,4 +2,4 @@
 KDE_ENABLE_HIDDEN_VISIBILITY
 KDE_INIT_DOXYGEN([KDE Utils API Reference], [Version $VERSION])
 AM_MAINTAINER_MODE
-CXXFLAGS="$CXXFLAGS -DQT_CLEAN_NAMESPACE  -DQT_NO_ASCII_CAST"
+CXXFLAGS="$CXXFLAGS  -DQT_NO_ASCII_CAST"