diff --git a/src/cephadm/cephadm b/src/cephadm/cephadm
index ed0068011ba..2a3632dc365 100755
--- a/src/cephadm/cephadm
+++ b/src/cephadm/cephadm
@@ -2546,6 +2546,10 @@ def get_daemon_args(ctx, fsid, daemon_type, daemon_id):
                 if 'ports' in meta and meta['ports']:
                     port = meta['ports'][0]
             r += [f'--web.listen-address={ip}:{port}']
+            if daemon_type == 'prometheus':
+                scheme = 'http'
+                host = get_fqdn()
+                r += [f'--web.external-url={scheme}://{host}:{port}']
         if daemon_type == 'alertmanager':
             config = get_parm(ctx.config_json)
             peers = config.get('peers', list())  # type: ignore
diff --git a/src/cephadm/tests/test_cephadm.py b/src/cephadm/tests/test_cephadm.py
index 597f4047c81..aed95d85fc0 100644
--- a/src/cephadm/tests/test_cephadm.py
+++ b/src/cephadm/tests/test_cephadm.py
@@ -1079,6 +1079,14 @@ class TestMonitoring(object):
         version = cd.Monitoring.get_version(ctx, 'container_id', daemon_type)
         assert version == '0.16.1'
 
+    def test_prometheus_external_url(self):
+        ctx = cd.CephadmContext()
+        daemon_type = 'prometheus'
+        daemon_id = 'home'
+        fsid = 'aaf5a720-13fe-4a3b-82b9-2d99b7fd9704'
+        args = cd.get_daemon_args(ctx, fsid, daemon_type, daemon_id)
+        assert any([x.startswith('--web.external-url=http://') for x in args])
+
     @mock.patch('cephadm.call')
     def test_get_version_node_exporter(self, _call):
         ctx = cd.CephadmContext()