diff --git a/server/djrandom/frontend/latency.py b/server/djrandom/frontend/latency.py
index 7cc3b2fa100c02fc6030ce392d433169d0c0baf0..066410c976f4488ed937374fdf431e20bffbc785 100644
--- a/server/djrandom/frontend/latency.py
+++ b/server/djrandom/frontend/latency.py
@@ -82,7 +82,7 @@ class LatencyProfilerMiddleware(object):
             result.append('<tr><td class="url">%s</td><td>%d</td>' % (
                     url, sum(values)))
             chart = pygooglechart.SparkLineChart(80, 25)
-            chart.set_data(values)
+            chart.add_data(values)
             for count, pct in _percent(values):
                 result.append('<td>%d (%.2g%%)</td>' % (count, pct))
             result.append('<td><img src="%s" width="80" height="25"></td>' %