diff --git a/src/auditor/taler-wire-auditor.c b/src/auditor/taler-wire-auditor.c
index ac3a7b0f4..c0b29eb15 100644
--- a/src/auditor/taler-wire-auditor.c
+++ b/src/auditor/taler-wire-auditor.c
@@ -509,6 +509,7 @@ complain_out_not_found (void *cls,
 {
   struct ReserveOutInfo *roi = value;
 
+  (void) roi;
   /* FIXME (#4963): log more precisely which wire transfer (and amount)
      is bogus. */
   report_row_inconsistency ("reserves_out",