diff --git a/armsrc/hitag2.c b/armsrc/hitag2.c
index 72211b037..e64b08338 100644
--- a/armsrc/hitag2.c
+++ b/armsrc/hitag2.c
@@ -1307,7 +1307,7 @@ void SniffHitag2(void) {
 }
 
 // Hitag2 simulation
-void SimulateHitag2() {
+void SimulateHitag2(void) {
 
     BigBuf_free();
     BigBuf_Clear_ext(false);