diff --git a/src/python/oftest/testutils.py b/src/python/oftest/testutils.py
index 127260a..fcd8f21 100644
--- a/src/python/oftest/testutils.py
+++ b/src/python/oftest/testutils.py
@@ -1207,7 +1207,7 @@
         if (pkts == None or pkt_diff >= pkts) and \
            (bytes == None or byte_diff >= bytes):
             break
-        sleep(0.1)
+        time.sleep(0.1)
 
     if pkts != None:
         test.assertEquals(pkt_diff, pkts, "Flow packet counter not updated properly (expected increase of %d, got increase of %d)" % (pkts, pkt_diff))
@@ -1295,7 +1295,7 @@
         if (pkts == None or pkt_diff >= pkts) and \
            (bytes == None or byte_diff >= bytes):
             break
-        sleep(0.1)
+        time.sleep(0.1)
 
     if pkts != None:
         test.assertEquals(pkt_diff, pkts, "Queue packet counter not updated properly (expected increase of %d, got increase of %d)" % (pkts, pkt_diff))