diff --git a/src/beep.c b/src/beep.c
index 33c6d7f..f24bc91 100644
--- a/src/beep.c
+++ b/src/beep.c
@@ -4,7 +4,6 @@
 #include <unistd.h> // for usleep()
 
 #include "beep.h"
-#include "util.h"
 
 #ifdef PORTAUDIO 
 // http://stackoverflow.com/questions/7678470/generating-sound-of-a-particular-frequency-using-gcc-in-ubuntu
@@ -184,7 +183,7 @@ int beep(double freq_hz, double duration_sec)
 {
 if (freq_hz <= 0.0)
 {
-		msleep(duration_sec*1000.);
+		usleep(duration_sec*1000.*1000);
 return 0;
 }
   double p1,p2,f1,f2;
diff --git a/src/util.h b/src/util.h
index 558511d..da857f3 100644
--- a/src/util.h
+++ b/src/util.h
@@ -2,4 +2,4 @@ void current_utc_time(struct timespec *ts);
 long fastclock(void);
 int kbhit (void);
 void msleep(int d);
-extern void *get_in_addr(struct sockaddr *sa);
+void *get_in_addr(struct sockaddr *sa);