diff --git a/src/proxy.c b/src/proxy.c
index 54598d2..0e204e7 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -225,6 +225,8 @@
 		free(rdr->rdr_str);
 		list_for_each_entry_safe(lf, lfb, &rdr->rdr_fmt, list) {
 			LIST_DELETE(&lf->list);
+			release_sample_expr(lf->expr);
+			free(lf->arg);
 			free(lf);
 		}
 		free(rdr);