diff --git a/app-office/libreoffice/libreoffice-9999.ebuild b/app-office/libreoffice/libreoffice-9999.ebuild
index a9f9652d40cac..a48c1bc39d324 100644
--- a/app-office/libreoffice/libreoffice-9999.ebuild
+++ b/app-office/libreoffice/libreoffice-9999.ebuild
@@ -359,6 +359,7 @@ src_configure() {
 	export PYTHON_LIBS=$(python_get_LIBS)
 
 	if use kde; then
+		export QT_SELECT=5 # bug 639620 needs proper fix though
 		export QT5DIR="$(qt5_get_bindir)/../"
 		export MOC5="$(qt5_get_bindir)/moc"
 	fi