diff --git a/speaker-test/speaker-test.c b/speaker-test/speaker-test.c
index 65ab523..4804bcf 100644
--- a/speaker-test/speaker-test.c
+++ b/speaker-test/speaker-test.c
@@ -283,6 +283,8 @@ static const int	supported_formats[] = {
   SND_PCM_FORMAT_S16_LE,
   SND_PCM_FORMAT_S16_BE,
   SND_PCM_FORMAT_FLOAT_LE,
+  SND_PCM_FORMAT_S24_3LE,
+  SND_PCM_FORMAT_S24_3BE,
   SND_PCM_FORMAT_S32_LE,
   SND_PCM_FORMAT_S32_BE,
   -1
@@ -325,6 +327,18 @@ static void do_generate(uint8_t *frames, int channel, int count,
       case SND_PCM_FORMAT_FLOAT_LE:
 	*samp_f++ = res.f;
         break;
+      case SND_PCM_FORMAT_S24_3LE:
+        res.i >>= 8;
+        *samp8++ = LE_INT(res.i);
+        *samp8++ = LE_INT(res.i) >> 8;
+        *samp8++ = LE_INT(res.i) >> 16;
+        break;
+      case SND_PCM_FORMAT_S24_3BE:
+        res.i >>= 8;
+        *samp8++ = BE_INT(res.i);
+        *samp8++ = BE_INT(res.i) >> 8;
+        *samp8++ = BE_INT(res.i) >> 16;
+        break;
       case SND_PCM_FORMAT_S32_LE:
 	*samp32++ = LE_INT(res.i);
         break;