diff --git a/lib/util-iso-image.sh b/lib/util-iso-image.sh
index 27e85dc..9f48184 100644
--- a/lib/util-iso-image.sh
+++ b/lib/util-iso-image.sh
@@ -66,9 +66,11 @@ configure_environment(){
 		cinnamon*|deepin*|gnome|i3|lxde|mate|netbook|openbox|pantheon|xfce*)
 			echo "QT_STYLE_OVERRIDE=gtk" >> $1/etc/environment
 			if [[ -f "$1/usr/lib/qt/plugins/platformthemes/libqt5ct.so" ]];then
-				sed -i 's|QT_STYLE_OVERRIDE=gtk|QT_QPA_PLATFORMTHEME=qt5ct|g' $1/etc/environment
+				sed -i '/QT_STYLE_OVERRIDE=gtk/d' $1/etc/environment
+				echo "QT_STYLE_OVERRIDE=gtk2" >> $1/etc/environment
 			fi
 			if [[ -f "$1/usr/lib/qt/plugins/styles/libqgtk2style.so" ]];then
+				sed -i '/QT_STYLE_OVERRIDE=gtk/d' $1/etc/environment
 				echo "QT_STYLE_OVERRIDE=gtk2" >> $1/etc/environment
 			fi
 		;;