diff --git a/releasenotes/notes/fix-log-url-mqtt-91395ace0f6633e8.yaml b/releasenotes/notes/fix-log-url-mqtt-91395ace0f6633e8.yaml
new file mode 100644
index 0000000000..bf0fd3e78a
--- /dev/null
+++ b/releasenotes/notes/fix-log-url-mqtt-91395ace0f6633e8.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    The MQTT reporter now sets the log_url for retried builds correctly.
+    The link to the build result page is reported in a dedicated web_url
+    field.
diff --git a/zuul/driver/mqtt/mqttreporter.py b/zuul/driver/mqtt/mqttreporter.py
index 8c3905e356..618378b82b 100644
--- a/zuul/driver/mqtt/mqttreporter.py
+++ b/zuul/driver/mqtt/mqttreporter.py
@@ -91,7 +91,7 @@ class MQTTReporter(BaseReporter):
                 retry_builds = item.current_build_set.getRetryBuildsForJob(
                     job.name)
                 for build in retry_builds:
-                    (result, url) = item.formatJobResult(job, build)
+                    (result, web_url) = item.formatJobResult(job, build)
                     retry_build_information = {
                         'job_name': job.name,
                         'voting': job.voting,
@@ -99,7 +99,8 @@ class MQTTReporter(BaseReporter):
                         'start_time': build.start_time,
                         'end_time': build.end_time,
                         'execute_time': build.execute_time,
-                        'log_url': url,
+                        'log_url': build.log_url,
+                        'web_url': web_url,
                         'result': result,
                     }
                     message['buildset']['retry_builds'].append(