diff --git a/src/screencast/pipewire_screencast.c b/src/screencast/pipewire_screencast.c
index f88af91..3f24e61 100644
--- a/src/screencast/pipewire_screencast.c
+++ b/src/screencast/pipewire_screencast.c
@@ -119,7 +119,8 @@ static void pwr_handle_stream_param_changed(void *data, uint32_t id,
 		SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
 		SPA_PARAM_BUFFERS_size,    SPA_POD_Int(cast->simple_frame.size),
 		SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(cast->simple_frame.stride),
-		SPA_PARAM_BUFFERS_align,   SPA_POD_Int(ALIGN));
+		SPA_PARAM_BUFFERS_align,   SPA_POD_Int(ALIGN),
+		SPA_PARAM_BUFFERS_dataType, SPA_POD_Int((1<<SPA_DATA_MemPtr)));
 
 	params[1] = spa_pod_builder_add_object(&b,
 		SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,