diff --git a/spa/plugins/volume/volume.c b/spa/plugins/volume/volume.c
index 493cd7926..31c3af175 100644
--- a/spa/plugins/volume/volume.c
+++ b/spa/plugins/volume/volume.c
@@ -525,7 +525,7 @@ impl_node_port_use_buffers(void *object,
 		b->flags = direction == SPA_DIRECTION_INPUT ? BUFFER_FLAG_OUT : 0;
 		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
 
-		if (d[0].data == NULL) {
+		if (d[0].data != NULL) {
 			b->ptr = d[0].data;
 			b->size = d[0].maxsize;
 		} else {