diff --git a/tests/bench_sizeof_coretypes/tests/01-run.py b/tests/bench_sizeof_coretypes/tests/01-run.py
index b6b4d4d367..f7cc0da9a8 100755
--- a/tests/bench_sizeof_coretypes/tests/01-run.py
+++ b/tests/bench_sizeof_coretypes/tests/01-run.py
@@ -6,8 +6,8 @@
 # General Public License v2.1. See the file LICENSE in the top level
 # directory for more details.
 
-import os
 import sys
+from testrunner import run
 
 
 def testfunc(child):
@@ -15,6 +15,4 @@ def testfunc(child):
 
 
 if __name__ == "__main__":
-    sys.path.append(os.path.join(os.environ['RIOTTOOLS'], 'testrunner'))
-    from testrunner import run
     sys.exit(run(testfunc))