diff --git a/configure.in.in b/configure.in.in
index 1cdda0b..fc75ba2 100644
--- a/configure.in.in
+++ b/configure.in.in
@@ -99,7 +99,7 @@ AC_SUBST(GV_ASM_DEFS)
 #
 LIBMNG=
 CXXFLAGS_SAVE="$CXXFLAGS"
-CXXFLAGS="$CXXFLAGS -DQT_CLEAN_NAMESPACE"
+CXXFLAGS="$CXXFLAGS"
 KDE_CHECK_HEADER(libmng.h,
     [
     KDE_CHECK_LIB(mng, mng_initialize,
diff --git a/src/gvcore/mngformattype.cpp b/src/gvcore/mngformattype.cpp
index f613f05..fa1e445 100644
--- a/src/gvcore/mngformattype.cpp
+++ b/src/gvcore/mngformattype.cpp
@@ -75,10 +75,6 @@
 
 #include <config.h>
 
-#ifndef TQT_CLEAN_NAMESPACE
-#define TQT_CLEAN_NAMESPACE
-#endif
-
 #include "tqdatetime.h"
 #include "mngformattype.h"
 
diff --git a/src/imageutils/Makefile.am b/src/imageutils/Makefile.am
index 6f2e08f..100d4b0 100644
--- a/src/imageutils/Makefile.am
+++ b/src/imageutils/Makefile.am
@@ -1,7 +1,4 @@
-# QT_CLEAN_NAMESPACE is needed when building with automake, otherwise
-# compilation fails in jpegcontent.cpp
-AM_CPPFLAGS = -I$(srcdir) -I$(srcdir)/.. $(LIBEXIF_CFLAGS) $(all_includes) \
-	-DQT_CLEAN_NAMESPACE
+AM_CPPFLAGS = -I$(srcdir) -I$(srcdir)/.. $(LIBEXIF_CFLAGS) $(all_includes)
 AM_CCASFLAGS = -I$(srcdir) $(GV_ASM_DEFS)
 
 KDE_CXXFLAGS = $(USE_EXCEPTIONS)