diff --git a/src/test/test_buffers.c b/src/test/test_buffers.c
index 6dd7715936..1253976917 100644
--- a/src/test/test_buffers.c
+++ b/src/test/test_buffers.c
@@ -513,6 +513,7 @@ test_buffer_allocation_tracking(void *arg)
   buf_free(buf1);
   buf_free(buf2);
   buf_shrink_freelists(1);
+  tor_free(junk);
 }
 
 static void