diff --git a/sources.cfg b/sources.cfg
index 12490dcc..9a1564f7 100644
--- a/sources.cfg
+++ b/sources.cfg
@@ -19,7 +19,7 @@ entrouvert_push = git+ssh://git@repos.entrouvert.org
 collective.contact.core = git ${remotes:collective}/collective.contact.core.git pushurl=${remotes:collective_push}/collective.contact.core.git branch=plone5
 collective.contact.facetednav = git ${remotes:collective}/collective.contact.facetednav.git pushurl=${remotes:collective_push}/collective.contact.facetednav.git branch=plone5
 collective.contact.widget = git ${remotes:collective}/collective.contact.widget.git pushurl=${remotes:collective_push}/collective.contact.widget.git branch=plone5
-plone.formwidget.masterselect = git ${remotes:collective}/plone.formwidget.masterselect.git pushurl=${remotes:collective_push}/plone.formwidget.masterselect.git
+plone.formwidget.masterselect = git ${remotes:collective}/plone.formwidget.masterselect.git pushurl=${remotes:collective_push}/plone.formwidget.masterselect.git branch=python3branch
 ecreall.helpers.upgrade = git ${remotes:tdesvenain}/ecreall.helpers.upgrade.git pushurl=${remotes:tdesvenain_push}/ecreall.helpers.upgrade.git
 collective.excelexport = git ${remotes:collective}/collective.excelexport.git pushurl=${remotes:collective_push}/collective.excelexport.git
 plone.formwidget.contenttree = git ${remotes:plone}/plone.formwidget.contenttree.git pushurl=${remotes:plone_push}/plone.formwidget.contenttree.git branch=python3