diff --git a/runbot_merge/models/pull_requests.py b/runbot_merge/models/pull_requests.py
index fae62130..08a44220 100644
--- a/runbot_merge/models/pull_requests.py
+++ b/runbot_merge/models/pull_requests.py
@@ -1,3 +1,4 @@
+import ast
 import base64
 import collections
 import datetime
@@ -217,6 +218,7 @@ class Repository(models.Model):
         "`success` for a PR or staging to be valid",
         default='legal/cla,ci/runbot'
     )
+    branch_filter = fields.Char(default='[(1, "=", 1)]', help="Filter branches valid for this repository")
 
     def github(self, token_field='github_token'):
         return github.GH(self.project_id[token_field], self.name)
@@ -284,6 +286,10 @@ class Repository(models.Model):
                 'repository': {'full_name': self.name},
             })
 
+    def having_branch(self, branch):
+        branches = self.env['runbot_merge.branch'].search
+        return self.filtered(lambda r: branch in branches(ast.literal_eval(r.branch_filter)))
+
 class Branch(models.Model):
     _name = _description = 'runbot_merge.branch'
     _order = 'sequence, name'
@@ -388,7 +394,7 @@ class Branch(models.Model):
 
         Batch = self.env['runbot_merge.batch']
         staged = Batch
-        meta = {repo: {} for repo in self.project_id.repo_ids}
+        meta = {repo: {} for repo in self.project_id.repo_ids.having_branch(self)}
         for repo, it in meta.items():
             gh = it['gh'] = repo.github()
             it['head'] = gh.head(self.name)
@@ -435,7 +441,7 @@ class Branch(models.Model):
         })
         # create staging branch from tmp
         token = self.project_id.github_token
-        for r in self.project_id.repo_ids:
+        for r in self.project_id.repo_ids.having_branch(self):
             it = meta[r]
             staging_head = heads[r.name]
             _logger.info(
@@ -1573,7 +1579,7 @@ class Stagings(models.Model):
         logger.info("Checking active staging %s (state=%s)", self, self.state)
         project = self.target.project_id
         if self.state == 'success':
-            gh = {repo.name: repo.github() for repo in project.repo_ids}
+            gh = {repo.name: repo.github() for repo in project.repo_ids.having_branch(self.target)}
             staging_heads = json.loads(self.heads)
             self.env.cr.execute('''
             SELECT 1 FROM runbot_merge_pull_requests
diff --git a/runbot_merge/tests/test_multirepo.py b/runbot_merge/tests/test_multirepo.py
index 36714005..a92b3ea4 100644
--- a/runbot_merge/tests/test_multirepo.py
+++ b/runbot_merge/tests/test_multirepo.py
@@ -716,3 +716,31 @@ class TestBlocked:
 
         with repo_b: b.post_comment('hansen p=0', config['role_reviewer']['token'])
         assert not pr_a.blocked
+
+def test_different_branches(env, project, repo_a, repo_b, config):
+    project.write({
+        'branch_ids': [(0, 0, {'name': 'dev'})]
+    })
+    # repo_b only works with master
+    env['runbot_merge.repository'].search([('name', '=', repo_b.name)])\
+        .branch_filter = '[("name", "=", "master")]'
+    with repo_a, repo_b:
+        make_branch(repo_a, 'dev', 'initial', {'a': '0'})
+        make_branch(repo_a, 'master', 'initial', {'b': '0'})
+        make_branch(repo_b, 'master', 'initial', {'b': '0'})
+
+        pr_a = make_pr(
+            repo_a, 'xxx', [{'a': '1'}],
+            target='dev',
+            user=config['role_user']['token'],
+            reviewer=config['role_reviewer']['token']
+        )
+    env.run_crons()
+
+    with repo_a:
+        pr_a.post_comment('hansen r+', config['role_reviewer']['token'])
+        repo_a.post_status('heads/staging.dev', 'success', 'legal/cla')
+        repo_a.post_status('heads/staging.dev', 'success', 'ci/runbot')
+    env.run_crons()
+
+    assert to_pr(env, pr_a).state == 'merged'