diff --git a/audio/audio.c b/audio/audio.c
index ed2b9d5f7e..886725747b 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -995,7 +995,7 @@ void AUD_set_active_in (SWVoiceIn *sw, int on)
  */
 static size_t audio_frontend_frames_in(SWVoiceIn *sw, size_t frames_in)
 {
-    return ((int64_t)frames_in << 32) / sw->ratio;
+    return (int64_t)frames_in * sw->ratio >> 32;
 }
 
 static size_t audio_get_avail (SWVoiceIn *sw)
diff --git a/audio/audio_template.h b/audio/audio_template.h
index 98ab557684..720a32e57e 100644
--- a/audio/audio_template.h
+++ b/audio/audio_template.h
@@ -110,7 +110,11 @@ static int glue (audio_pcm_sw_alloc_resources_, TYPE) (SW *sw)
         return 0;
     }
 
+#ifdef DAC
     samples = ((int64_t) sw->HWBUF->size << 32) / sw->ratio;
+#else
+    samples = (int64_t)sw->HWBUF->size * sw->ratio >> 32;
+#endif
 
     sw->buf = audio_calloc(__func__, samples, sizeof(struct st_sample));
     if (!sw->buf) {