diff --git a/src/beep.c b/src/beep.c
index 3e49b08..923cc05 100644
--- a/src/beep.c
+++ b/src/beep.c
@@ -199,16 +199,6 @@ int beep_test(void)
 /*
  * This extra small demo sends sinusoidal  samples to your speakers.
  */
-#include <stdint.h>
-#include <alsa/asoundlib.h>
-#include <math.h>
-
-static char *device = "hw:0,0"; /* playback device */
-snd_output_t *output = NULL;
-
-#define FRAMES 16384L
-
-int16_t buffer[FRAMES*2]; /* 16bit stereo sound samples */
 int beep_test(void)
 {
     int err;
diff --git a/src/beep.h b/src/beep.h
index aa5c58b..0484d81 100644
--- a/src/beep.h
+++ b/src/beep.h
@@ -45,6 +45,20 @@ void msleep(int d);
 int beep_test(void);
 #endif
 
+#ifdef ALSA
+#include <stdint.h>
+#include <alsa/asoundlib.h>
+#include <math.h>
+
+static char *device = "hw:0,0"; /* playback device */
+snd_output_t *output = NULL;
+
+#define FRAMES 16384L
+
+int16_t buffer[FRAMES*2]; /* 16bit stereo sound samples */
+
+#endif
+
 // compatibility to old interface
 int beep(double freq_hz, double duration_sec);
 int beep_init();