diff --git a/examples/graphviz/grouper.py b/examples/graphviz/grouper.py
index 9bdb711..312fad2 100755
--- a/examples/graphviz/grouper.py
+++ b/examples/graphviz/grouper.py
@@ -2,8 +2,6 @@
 '''
 This example demonstrates the use of grouping.
 '''
-import time
-
 from pycallgraph import PyCallGraph
 from pycallgraph import Config
 from pycallgraph import GlobbingFilter