diff --git a/src/pcm/pcm_ioplug.c b/src/pcm/pcm_ioplug.c
index a437ca326..33a6aa78f 100644
--- a/src/pcm/pcm_ioplug.c
+++ b/src/pcm/pcm_ioplug.c
@@ -727,7 +727,12 @@ static snd_pcm_sframes_t snd_pcm_ioplug_avail_update(snd_pcm_t *pcm)
 			const snd_pcm_channel_area_t *areas;
 			snd_pcm_uframes_t offset, size = UINT_MAX;
 			snd_pcm_sframes_t result;
+			/* avail may be > buffer_size and thus must be manually limited if used for 2nd transfer() call
+			   w/o another mmap_commit() plus mmap_begin() issued after 1st transfer() */
+			snd_pcm_uframes_t avail_part = avail % pcm->buffer_size;
 
+			if (avail && !avail_part) /*avail = (n*buffer_size) results in buffer_size */
+				avail_part = pcm->buffer_size;
 			__snd_pcm_mmap_begin(pcm, &areas, &offset, &size);
 			result = io->data->callback->transfer(io->data, areas, offset, size);
 			if (result < 0)
@@ -737,9 +742,9 @@ static snd_pcm_sframes_t snd_pcm_ioplug_avail_update(snd_pcm_t *pcm)
 			   contiguous area at the end of the mmap we
 			   must transfer the remaining data to the
 			   beginning of the mmap. */
-			if (size < avail) {
+			if (size < avail_part) {
 				result = io->data->callback->transfer(io->data, areas,
-								      0, avail - size);
+								      0, avail_part - size);
 				if (result < 0)
 					return result;
 			}