diff --git a/src/beep.c b/src/beep.c
index 7eb2e6b..7549efd 100644
--- a/src/beep.c
+++ b/src/beep.c
@@ -182,9 +182,10 @@ snd_output_t *output = NULL;
 
 int beep(double freq_hz, double duration_sec)
 {
-if (freq_hz <= 0.)
+if (freq_hz <= 0.0)
 {
 		msleep(duration_sec*1000.);
+printf (" no tone ");
 return 0;
 }
   double p1,p2,f1,f2;