diff --git a/master/custom/pr_reporter.py b/master/custom/pr_reporter.py
index d0352d57..61b17a6c 100644
--- a/master/custom/pr_reporter.py
+++ b/master/custom/pr_reporter.py
@@ -171,8 +171,8 @@ def sendMessage(self, reports):
             )
 
     def _getURLForBuild(self, builderid, build_number):
-        prefix = self.master.config.buildbotURL
-        return prefix + "#builders/%d/builds/%d" % (builderid, build_number)
+        prefix = self.master.config.buildbotURL.rstrip('/')
+        return f"{prefix}/#/builders/{builderid}/builds/{build_number}"
 
     def createStatus(
         self,