diff --git a/lib/if2ip.c b/lib/if2ip.c
index 99fa01106..43584c75c 100644
--- a/lib/if2ip.c
+++ b/lib/if2ip.c
@@ -202,6 +202,7 @@ if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
                           const char *interf, char *buf, int buf_size)
 {
     (void) af;
+    (void) remote_scope;
     (void) interf;
     (void) buf;
     (void) buf_size;