diff --git a/apps/powertrace/powertrace.c b/apps/powertrace/powertrace.c
index 66b469afe..fcbdffa84 100644
--- a/apps/powertrace/powertrace.c
+++ b/apps/powertrace/powertrace.c
@@ -293,7 +293,7 @@ input_printsniffer(void)
 }
 /*---------------------------------------------------------------------------*/
 static void
-output_printsniffer(void)
+output_printsniffer(int mac_status)
 {
   static int seqno = 0;
   sniffprint("O", seqno++);
diff --git a/apps/shell/shell-rime-sniff.c b/apps/shell/shell-rime-sniff.c
index 277ce26da..aa2d9cf75 100644
--- a/apps/shell/shell-rime-sniff.c
+++ b/apps/shell/shell-rime-sniff.c
@@ -114,7 +114,7 @@ input_sniffer(void)
 }
 /*---------------------------------------------------------------------------*/
 static void
-output_sniffer(void)
+output_sniffer(int mac_status)
 {
   if(sniff_for_attributes) {
     sniff_attributes_output(SNIFFER_ATTRIBUTES_OUTPUT);