diff --git a/acinclude.m4 b/acinclude.m4
index 2bd31ad..acbceba 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1884,7 +1884,7 @@ else
  all_includes="$KDE_INCLUDES $all_includes"
 fi
 
-KDE_DEFAULT_CXXFLAGS="-DQT_CLEAN_NAMESPACE -DQT_NO_ASCII_CAST -DQT_NO_STL -DQT_NO_COMPAT -DQT_NO_TRANSLATION"
+KDE_DEFAULT_CXXFLAGS="-DQT_NO_ASCII_CAST -DQT_NO_STL -DQT_NO_COMPAT -DQT_NO_TRANSLATION"
  
 KDE_LDFLAGS="-L$kde_libraries"
 if test ! "$kde_libraries" = "$x_libraries" && test ! "$kde_libraries" = "$qt_libraries" ; then 
diff --git a/configure.in.in b/configure.in.in
index 05e7e29..e1fe50a 100644
--- a/configure.in.in
+++ b/configure.in.in
@@ -39,7 +39,7 @@ dnl in this space add everything you want to check for;
 dnl examples are specific headers, libraries, etc.
 dnl everything to compile and run a KDE program is already checked
 
-CPPFLAGS="$CPPFLAGS -DQT_NO_ASCII_CAST -DQT_NO_COMPAT -DQT_CLEAN_NAMESPACE -Wall -I\$(top_srcdir)/ -I\$(top_srcdir)/bibletime -I\$(top_builddir)/bibletime"
+CPPFLAGS="$CPPFLAGS -DQT_NO_ASCII_CAST -DQT_NO_COMPAT -Wall -I\$(top_srcdir)/ -I\$(top_srcdir)/bibletime -I\$(top_builddir)/bibletime"
 AC_CHECK_STATIC_LINKING(ac_use_static)
 AC_CHECK_SWORD(1.5.9, [$ac_use_static])
 AC_CHECK_CLUCENE([$ac_use_static])