diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index cacb5d0..5900983 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -171,7 +171,8 @@ static int graph_write(int argc, const char **argv)
 		flags |= COMMIT_GRAPH_WRITE_SPLIT;
 	if (opts.progress)
 		flags |= COMMIT_GRAPH_WRITE_PROGRESS;
-	if (opts.enable_changed_paths)
+	if (opts.enable_changed_paths ||
+	    git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
 		flags |= COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
 
 	read_replace_refs = 0;