1 files changed, 1 insertions, 0 deletions

diff --git a/concat.c b/concat.c
index a4bf1aa..22645e4 100644
--- a/concat.c
+++ b/concat.c
@@ -203,4 +203,5 @@ void concatData(struct List threads, struct List items) {
 	}
 
 	listFree(flat);
+	envelopeFree(envelope);
 }