diff --git a/contrib/scalar/t/t9099-scalar.sh b/contrib/scalar/t/t9099-scalar.sh
index 10b1172a8a..fac86a5755 100755
--- a/contrib/scalar/t/t9099-scalar.sh
+++ b/contrib/scalar/t/t9099-scalar.sh
@@ -109,14 +109,14 @@ test_expect_success UNZIP 'scalar diagnose' '
 	sed -n "s/.*$SQ\\(.*\\.zip\\)$SQ.*/\\1/p" <err >zip_path &&
 	zip_path=$(cat zip_path) &&
 	test -n "$zip_path" &&
-	unzip -v "$zip_path" &&
+	"$GIT_UNZIP" -v "$zip_path" &&
 	folder=${zip_path%.zip} &&
 	test_path_is_missing "$folder" &&
-	unzip -p "$zip_path" diagnostics.log >out &&
+	"$GIT_UNZIP" -p "$zip_path" diagnostics.log >out &&
 	test_file_not_empty out &&
-	unzip -p "$zip_path" packs-local.txt >out &&
+	"$GIT_UNZIP" -p "$zip_path" packs-local.txt >out &&
 	grep "$(pwd)/.git/objects" out &&
-	unzip -p "$zip_path" objects-local.txt >out &&
+	"$GIT_UNZIP" -p "$zip_path" objects-local.txt >out &&
 	grep "^Total: [1-9]" out
 '