diff --git a/tools/pyflakes-strict.sh b/tools/pyflakes-strict.sh
index 86ce4b4349f49418fdab6da17ce3c37085d720b1..0725b2ca60cc59746a8ac502de8e8d9e1ecbbc2b 100755
--- a/tools/pyflakes-strict.sh
+++ b/tools/pyflakes-strict.sh
@@ -1,5 +1,7 @@
 #!/bin/sh -e
 
+. "$(dirname $0)/common.sh"
+
 cd "$(dirname $0)/.."
 
 die () {
@@ -7,15 +9,15 @@ die () {
     exit 1
 }
 
-python3 -c 'import flake8' || die "Please install flake8 (e.g. apt install flake8)"
-python3 -c 'import bugbear' || die "Please install flake8-bugbear (e.g. pip3 install flake8-bugbear)"
-python3 -c 'import asttokens' || die "Please install asttokens (e.g. apt install python3-asttokens)"
+$PYTHON3 -c 'import flake8' || die "Please install flake8 (e.g. apt install flake8)"
+$PYTHON3 -c 'import bugbear' || die "Please install flake8-bugbear (e.g. pip3 install flake8-bugbear)"
+$PYTHON3 -c 'import asttokens' || die "Please install asttokens (e.g. apt install python3-asttokens)"
 
 err=0
-./tools/hooks/run-flake8.py "$@"  || err=1
-./tools/hooks/check-ifexpr.py "$@" || err=1
-./tools/hooks/check-stringcut.py "$@" || err=1
-./tools/hooks/check-continuations.py "$@" || err=1
-./tools/hooks/check-trailing-commas.py "$@" || err=1
-./tools/hooks/check-line-length.py -l 120 "$@" || err=1
+$PYTHON3 ./tools/hooks/run-flake8.py "$@"  || err=1
+$PYTHON3 ./tools/hooks/check-ifexpr.py "$@" || err=1
+$PYTHON3 ./tools/hooks/check-stringcut.py "$@" || err=1
+$PYTHON3 ./tools/hooks/check-continuations.py "$@" || err=1
+$PYTHON3 ./tools/hooks/check-trailing-commas.py "$@" || err=1
+$PYTHON3 ./tools/hooks/check-line-length.py -l 120 "$@" || err=1
 exit $err