diff --git a/Makefile.python b/Makefile.python
--- a/Makefile.python
+++ b/Makefile.python
@@ -27,6 +27,13 @@
 check:
 	$(FLAKE) $(FLAKEFLAGS) swh $(PYTHON_BIN)
 
+.PHONY: check-staged
+check-staged:
+	$(FLAKE) $(FLAKEFLAGS) swh $(PYTHON_BIN)
+	git diff -z --staged --name-only -- '*.py' \
+		| xargs -0 -L1 -i'{}' /bin/sh -c \
+		"git show ':{}' | $(FLAKE) $(FLAKEFLAGS) --stdin-display-name '{}' -"
+
 .PHONY: lint
 lint:
 	$(LINT) $(LINTFLAGS) $(PYMODULE)
diff --git a/bin/git-add-pre-commit-hook b/bin/git-add-pre-commit-hook
--- a/bin/git-add-pre-commit-hook
+++ b/bin/git-add-pre-commit-hook
@@ -13,7 +13,7 @@
 if ! [ -x "$HOOK" ] ; then
     cat > "$HOOK" <<EOF
 #!/bin/sh
-make check
+make check-staged
 EOF
     chmod +x "$HOOK"
 fi