diff --git a/repoapi/models/gri.py b/repoapi/models/gri.py
index e750e6b..3aaf2f3 100644
--- a/repoapi/models/gri.py
+++ b/repoapi/models/gri.py
@@ -46,10 +46,14 @@ def gerrit_repo_add(instance):
     ppa, created = gri.get_or_create(
         param_ppa=instance.param_ppa,
         gerrit_change=instance.gerrit_change,
-        projectname=instance.projectname,
+        defaults={"projectname": instance.projectname},
     )
     if created:
         log.debug("ppa created", ppa=ppa)
+    elif ppa.projectname == "unknown":
+        ppa.projectname = instance.projectname
+        ppa.save()
+        log.info("ppa projectname updated")
 
 
 def gerrit_repo_del(instance):
diff --git a/repoapi/test/test_gerritinfo.py b/repoapi/test/test_gerritinfo.py
index a4521cb..096fc74 100644
--- a/repoapi/test/test_gerritinfo.py
+++ b/repoapi/test/test_gerritinfo.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2015 The Sipwise Team - http://sipwise.com
+# Copyright (C) 2015-2020 The Sipwise Team - http://sipwise.com
 #
 # This program is free software: you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by the Free
@@ -12,7 +12,7 @@
 #
 # You should have received a copy of the GNU General Public License along
 # with this program.  If not, see <http://www.gnu.org/licenses/>.
-from mock import patch
+from unittest.mock import patch
 
 from repoapi.models import GerritRepoInfo
 from repoapi.models import JenkinsBuildInfo
@@ -196,3 +196,19 @@ class GerritRepoInfoTestCase(BaseTest):
         )
         self.assertEqual(gri.count(), 0)
         rppa.assert_called_with("gerrit_MT10339_review2054")
+
+    def test_update_projectname(self, rppa, rp):
+        GerritRepoInfo.objects.create(
+            param_ppa="gerrit_MT10339_review2054",
+            gerrit_change="2054",
+            projectname="unknown",
+        )
+        param = self.get_defaults()
+        JenkinsBuildInfo.objects.create(**param)
+        gri = GerritRepoInfo.objects.filter(
+            param_ppa="gerrit_MT10339_review2054",
+            projectname=param["projectname"],
+        )
+        self.assertEqual(gri.count(), 1)
+        rppa.assert_not_called()
+        rp.assert_not_called()