diff --git a/eclass/qt4-build.eclass b/eclass/qt4-build.eclass
index 78d699f..0f52a2b 100644
--- a/eclass/qt4-build.eclass
+++ b/eclass/qt4-build.eclass
@@ -281,9 +281,6 @@ qt4-build_src_prepare() {
 			'QMAKE_CFLAGS+=${CFLAGS}' 'QMAKE_CXXFLAGS+=${CXXFLAGS}' 'QMAKE_LFLAGS+=${LDFLAGS}'&:" \
 		|| die "sed config.tests failed"
 
-	# Strip predefined CFLAGS from mkspecs (bug 312689)
-	sed -i -e '/^QMAKE_CFLAGS_RELEASE/s:+=.*:+=:' mkspecs/common/g++.conf || die
-
 	# Bug 172219
 	sed -e 's:/X11R6/:/:' -i mkspecs/$(qt_mkspecs_dir)/qmake.conf || die