diff --git a/lib/luks2/luks2_json_format.c b/lib/luks2/luks2_json_format.c
index 532b5d0d..ae49451f 100644
--- a/lib/luks2/luks2_json_format.c
+++ b/lib/luks2/luks2_json_format.c
@@ -360,6 +360,7 @@ int LUKS2_generate_hdr(
 
 	if (json_object_object_add_by_uint(jobj_segments, 0, jobj_segment)) {
 		json_object_put(jobj_segment);
+		r = -ENOMEM;
 		goto err;
 	}