diff --git a/buildbot_gitea/step_source.py b/buildbot_gitea/step_source.py
index dfb6b25..2a8cb00 100644
--- a/buildbot_gitea/step_source.py
+++ b/buildbot_gitea/step_source.py
@@ -17,7 +17,7 @@ class Gitea(Git):
     @defer.inlineCallbacks
     def _fetch(self, arg):
         res = yield super(Gitea, self)._fetch(arg)
-        if self.build.hasProperty("pr_id"):
+        if self.build.hasProperty("pr_id") and self.repourl == self.build.getProperty("base_git_ssh_url", None):
             remote = yield self._dovccmd(
                 ['config', 'remote.pr_source.url'], collectStdout=True, abandonOnFailure=False)
             if remote is None or remote.strip() is '':
@@ -30,4 +30,4 @@ class Gitea(Git):
                      self.build.getProperty("head_git_ssh_url", None)])
             yield self._dovccmd(['fetch', 'pr_source'])
             res = yield self._dovccmd(['merge', self.build.getProperty("head_sha", None)])
-        defer.returnValue(res)
\ No newline at end of file
+        defer.returnValue(res)