diff --git a/tests/run-internalbench.py b/tests/run-internalbench.py
index 2cf7f3443b..c9f783e474 100755
--- a/tests/run-internalbench.py
+++ b/tests/run-internalbench.py
@@ -8,16 +8,11 @@ import re
 from glob import glob
 from collections import defaultdict
 
-# Tests require at least CPython 3.3. If your default python3 executable
-# is of lower version, you can point MICROPY_CPYTHON3 environment var
-# to the correct executable.
 if os.name == "nt":
-    CPYTHON3 = os.getenv("MICROPY_CPYTHON3", "python3.exe")
     MICROPYTHON = os.getenv(
         "MICROPY_MICROPYTHON", "../ports/windows/build-standard/micropython.exe"
     )
 else:
-    CPYTHON3 = os.getenv("MICROPY_CPYTHON3", "python3")
     MICROPYTHON = os.getenv("MICROPY_MICROPYTHON", "../ports/unix/build-standard/micropython")