diff --git a/scripts/run_checks.py b/scripts/run_checks.py
index 2bcd489cf..148a5cd2f 100755
--- a/scripts/run_checks.py
+++ b/scripts/run_checks.py
@@ -208,9 +208,6 @@ def _check_file(fn):
                       for c in " \t"]):
                 print("Found whitespace at line ending in {}".format(fn))
                 ok = False
-            elif b' \t' in line or b'\t ' in line:
-                print("Found tab-space mix in {}".format(fn))
-                ok = False
             elif b'set_trace()' in line and not (
                     fn.endswith('debug.py') or fn.endswith('run_checks.py')):
                 print("Found set_trace in {}".format(fn))