diff --git a/tools/format.sh b/tools/format.sh
index ef5cc92..9685cdf 100755
--- a/tools/format.sh
+++ b/tools/format.sh
@@ -15,7 +15,7 @@
 
 # isort is not compatible with the default flake8 (H306), maybe flake8-isort
 # isort -rc -sl -fss ../tempest ../setup.py
-$AUTOPEP8 --exit-code --max-line-length=79 --experimental --in-place \
+$AUTOPEP8 --exit-code --max-line-length=79 --in-place \
           -r ../tempest ../setup.py
 ERROR=$?