diff --git a/scripts/check-phase10.2.sh b/scripts/check-phase10.2.sh
index 8281ccb..ab07406 100755
--- a/scripts/check-phase10.2.sh
+++ b/scripts/check-phase10.2.sh
@@ -30,7 +30,7 @@ refuse() {
 tracked_source_files() {
 	local repo="$1"
 	if git -C "$repo" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
-		git -C "$repo" ls-files -z -- '*.go' '*.tmpl' '*.sh'
+		git -C "$repo" ls-files -z -- '*.go' '*.tmpl' '*.sh' ':(exclude).planning/**'
 		return
 	fi
 	(
@@ -52,6 +52,7 @@ check_layout() {
 check_imports_in() {
 	local repo="$1" file name
 	while IFS= read -r -d '' file; do
+		[[ "$file" != .planning/* ]] || continue
 		[[ "$file" != 'scripts/check-phase10.2.sh' ]] || continue
 		for name in "${NAMES[@]}"; do
 			if grep -Fq "${IMPORT_PREFIX}${name}" "$repo/$file"; then
@@ -125,6 +126,11 @@ run_self_test() {
 		cp "$ROOT/modules/$name/README.md" "$scratch/modules/$name/README.md"
 	done
 
+	check_hygiene "$scratch" "$app"
+	mkdir -p "$scratch/.planning"
+	printf '%s%s\n' "$IMPORT_PREFIX" backpack >"$scratch/.planning/historical.go"
+	git -C "$scratch" init -q
+	git -C "$scratch" add README.md modules .planning/historical.go
 	check_hygiene "$scratch" "$app"
 
 	mkdir "$scratch/backpack"
@@ -132,8 +138,9 @@ run_self_test() {
 	rmdir "$scratch/backpack"
 
 	printf '%s%s\n' "$IMPORT_PREFIX" backpack >"$scratch/old_import.go"
+	git -C "$scratch" add old_import.go
 	expect_refusal 'old import' 'old import' "$scratch" "$app"
-	rm "$scratch/old_import.go"
+	git -C "$scratch" rm -q -f old_import.go
 
 	mv "$scratch/modules/backpack/README.md" "$scratch/modules/backpack/README.saved"
 	expect_refusal 'missing README' 'missing README' "$scratch" "$app"