diff --git a/distributed/dashboard/components/shared.py b/distributed/dashboard/components/shared.py
index 957dc0cf9b3..48f3c3df5df 100644
--- a/distributed/dashboard/components/shared.py
+++ b/distributed/dashboard/components/shared.py
@@ -2,7 +2,6 @@
 
 import asyncio
 import weakref
-from statistics import mean
 
 import tlz as toolz
 from bokeh.core.properties import without_property_validation
@@ -559,6 +558,9 @@ def get_data(self):
     @without_property_validation
     @log_errors
     def update(self):
+        def mean(x):
+            return sum(x) / len(x)
+
         self.source.stream(self.get_data(), 1000)
         self.label_source.data["cpu"] = [
             "{}: {:.1f}%".format(f.__name__, f(self.source.data["cpu"]))