diff --git a/hc/api/migrations/0008_auto_20150801_1213.py b/hc/api/migrations/0008_auto_20150801_1213.py
new file mode 100644
index 00000000..3858cbac
--- /dev/null
+++ b/hc/api/migrations/0008_auto_20150801_1213.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0007_ping'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ping',
+            name='ua',
+            field=models.CharField(max_length=200, blank=True),
+        ),
+    ]
diff --git a/hc/api/models.py b/hc/api/models.py
index d463e537..9ffd3e2a 100644
--- a/hc/api/models.py
+++ b/hc/api/models.py
@@ -65,5 +65,5 @@ class Ping(models.Model):
     created = models.DateTimeField(auto_now_add=True)
     remote_addr = models.GenericIPAddressField()
     method = models.CharField(max_length=10)
-    ua = models.CharField(max_length=100, blank=True)
+    ua = models.CharField(max_length=200, blank=True)
     body = models.TextField(blank=True)
diff --git a/hc/api/tests/test_ping.py b/hc/api/tests/test_ping.py
index 8a226db4..0b36b85e 100644
--- a/hc/api/tests/test_ping.py
+++ b/hc/api/tests/test_ping.py
@@ -1,6 +1,6 @@
 from django.test import Client, TestCase
 
-from hc.api.models import Check
+from hc.api.models import Check, Ping
 
 
 class PingTestCase(TestCase):
@@ -26,3 +26,28 @@ class PingTestCase(TestCase):
     def test_it_handles_bad_uuid(self):
         r = self.client.get("/ping/not-uuid/")
         assert r.status_code == 400
+
+    def test_it_handles_120_char_ua(self):
+        ua = ("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4) "
+              "AppleWebKit/537.36 (KHTML, like Gecko) "
+              "Chrome/44.0.2403.89 Safari/537.36")
+
+        check = Check()
+        check.save()
+        r = self.client.get("/ping/%s/" % check.code, HTTP_USER_AGENT=ua)
+        assert r.status_code == 200
+
+        pings = list(Ping.objects.all())
+        assert pings[0].ua == ua
+
+    def test_it_truncates_long_ua(self):
+        ua = "01234567890" * 30
+
+        check = Check()
+        check.save()
+        r = self.client.get("/ping/%s/" % check.code, HTTP_USER_AGENT=ua)
+        assert r.status_code == 200
+
+        pings = list(Ping.objects.all())
+        assert len(pings[0].ua) == 200
+        assert ua.startswith(pings[0].ua)
diff --git a/hc/api/views.py b/hc/api/views.py
index b481457a..e775b860 100644
--- a/hc/api/views.py
+++ b/hc/api/views.py
@@ -27,7 +27,8 @@ def ping(request, code):
     headers = request.META
     ping.remote_addr = headers.get("HTTP_X_REAL_IP", headers["REMOTE_ADDR"])
     ping.method = headers["REQUEST_METHOD"]
-    ping.ua = headers.get("HTTP_USER_AGENT", "")
+    # If User-Agent is longer than 200 characters, truncate it:
+    ping.ua = headers.get("HTTP_USER_AGENT", "")[:200]
     ping.body = request.body
     ping.save()