diff --git a/example/simple/src/ctx.c b/example/simple/src/ctx.c
index 9b39ac1..84f7f74 100644
--- a/example/simple/src/ctx.c
+++ b/example/simple/src/ctx.c
@@ -64,6 +64,7 @@ static uint32_t ctx_data_read(void *dst, ctx_data_t *src, uint32_t size)
 	struct volume_data *data = src;
 
 	memcpy(dst, data->ptr + data->offset, size);
+	data->offset += size;
 
 	return size;
 }
@@ -76,6 +77,7 @@ static uint32_t ctx_data_write(ctx_data_t *dst, const void *src, uint32_t size)
 	struct volume_data *data = dst;
 
 	memcpy(data->ptr + data->offset, src, size);
+	data->offset += size;
 
 	return size;
 }
@@ -88,6 +90,7 @@ static uint32_t ctx_data_zero(ctx_data_t *dst, uint32_t size)
 	struct volume_data *data = dst;
 
 	memset(data->ptr + data->offset, 0, size);
+	data->offset += size;
 
 	return size;
 }
diff --git a/example/simple/src/volume.c b/example/simple/src/volume.c
index 2eab9d7..52585a4 100644
--- a/example/simple/src/volume.c
+++ b/example/simple/src/volume.c
@@ -44,17 +44,19 @@ static void volume_close(ocf_volume_t volume)
  */
 static void volume_submit_io(struct ocf_io *io)
 {
+	struct myvolume_io *myvolume_io = ocf_io_get_priv(io);
 	struct volume_data *data;
 	struct myvolume *myvolume;
+	uint32_t offset = myvolume_io->offset;
 
 	data = ocf_io_get_data(io);
 	myvolume = ocf_volume_get_priv(ocf_io_get_volume(io));
 
 	if (io->dir == OCF_WRITE) {
 		memcpy(myvolume->mem + io->addr,
-				data->ptr + data->offset, io->bytes);
+				data->ptr + offset, io->bytes);
 	} else {
-		memcpy(data->ptr + data->offset,
+		memcpy(data->ptr + offset,
 				myvolume->mem + io->addr, io->bytes);
 	}