diff --git a/hc/front/tests/test_ping_details.py b/hc/front/tests/test_ping_details.py
index 1b26e8b1..b1c96f19 100644
--- a/hc/front/tests/test_ping_details.py
+++ b/hc/front/tests/test_ping_details.py
@@ -18,7 +18,7 @@ class LastPingTestCase(BaseTestCase):
         check = Check(user=self.alice)
         check.save()
 
-        Ping.objects.create(owner=check, fail=True)
+        Ping.objects.create(owner=check, kind="fail")
 
         self.client.login(username="alice@example.org", password="password")
         r = self.client.get("/checks/%s/last_ping/" % check.code)
@@ -28,7 +28,7 @@ class LastPingTestCase(BaseTestCase):
         check = Check(user=self.alice)
         check.save()
 
-        Ping.objects.create(owner=check, start=True)
+        Ping.objects.create(owner=check, kind="start")
 
         self.client.login(username="alice@example.org", password="password")
         r = self.client.get("/checks/%s/last_ping/" % check.code)
diff --git a/hc/front/views.py b/hc/front/views.py
index 5a220cfd..668189b7 100644
--- a/hc/front/views.py
+++ b/hc/front/views.py
@@ -377,7 +377,7 @@ def _get_events(check, limit):
 
     prev = None
     for ping in pings:
-        if ping.start and prev and not prev.start:
+        if ping.kind == "start" and prev and prev.kind != "start":
             delta = prev.created - ping.created
             if delta < ONE_HOUR:
                 setattr(prev, "delta", delta)
diff --git a/templates/front/details_events.html b/templates/front/details_events.html
index 14133174..08593bf4 100644
--- a/templates/front/details_events.html
+++ b/templates/front/details_events.html
@@ -10,9 +10,9 @@
         <td class="date"></td>
         <td class="time"></td>
         <td class="text-right">
-            {% if event.fail %}
+            {% if event.kind == "fail" %}
             <span class="label label-danger">Failure</span>
-            {% elif event.start %}
+            {% elif event.kind == "start" %}
             <span class="label label-start">Started</span>
             {% else %}
             <span class="label label-success">OK</span>
diff --git a/templates/front/log.html b/templates/front/log.html
index bf0a1f15..22a9db65 100644
--- a/templates/front/log.html
+++ b/templates/front/log.html
@@ -44,9 +44,9 @@
             <td class="date"></td>
             <td class="time"></td>
             <td class="text-right">
-                {% if event.fail %}
+                {% if event.kind == "fail" %}
                 <span class="label label-danger">Failure</span>
-                {% elif event.start %}
+                {% elif event.kind == "start" %}
                 <span class="label label-start">Started</span>
                 {% else %}
                 <span class="label label-success">OK</span>
diff --git a/templates/front/ping_details.html b/templates/front/ping_details.html
index d273657c..f2be8872 100644
--- a/templates/front/ping_details.html
+++ b/templates/front/ping_details.html
@@ -1,8 +1,8 @@
 <div class="modal-body">
     <h3>Ping #{{ ping.n }}
-        {% if ping.fail %}
+        {% if ping.kind == "fail" %}
         <span class="text-danger">(received via the <code>/fail</code> endpoint)</span>
-        {% elif ping.start %}
+        {% elif ping.kind == "start" %}
         <span class="text-success">(received via the <code>/start</code> endpoint)</span>
         {% endif %}
     </h3>