Missed import
diff --git a/tools/run_tests/run_performance_tests.py b/tools/run_tests/run_performance_tests.py
index 30865c6..2722d80 100755
--- a/tools/run_tests/run_performance_tests.py
+++ b/tools/run_tests/run_performance_tests.py
@@ -33,11 +33,13 @@
from __future__ import print_function
import argparse
+import collections
import itertools
import jobset
import json
import multiprocessing
import os
+import performance.scenario_config as scenario_config
import pipes
import re
import subprocess
@@ -46,7 +48,6 @@
import time
import traceback
import uuid
-import performance.scenario_config as scenario_config
_ROOT = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '../..'))