diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index 7753dfb..29fa98d 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -1063,7 +1063,7 @@
 	fb->handles[0] = gbm_bo_get_handle(bo).u32;
 	fb->format = pixel_format_get_info(gbm_bo_get_format(bo));
 	fb->modifier = DRM_FORMAT_MOD_INVALID;
-	fb->size = fb->strides[0] * fb->height;
+	fb->size = 0;
 	fb->fd = backend->drm.fd;
 
 	if (!fb->format) {