diff --git a/spa/include/spa/param/video/dsp-utils.h b/spa/include/spa/param/video/dsp-utils.h
index 590621c23..8944bf6d9 100644
--- a/spa/include/spa/param/video/dsp-utils.h
+++ b/spa/include/spa/param/video/dsp-utils.h
@@ -49,9 +49,11 @@ spa_format_video_dsp_build(struct spa_pod_builder *builder, uint32_t id,
 	if (info->format != SPA_VIDEO_FORMAT_UNKNOWN)
 		spa_pod_builder_add(builder,
 			SPA_FORMAT_VIDEO_format,	SPA_POD_Id(info->format), 0);
-	if (info->modifier != 0 || info->flags & SPA_VIDEO_FLAG_MODIFIER)
-		spa_pod_builder_add(builder,
-			SPA_FORMAT_VIDEO_modifier,	SPA_POD_Long(info->modifier), 0);
+	if (info->modifier != 0 || info->flags & SPA_VIDEO_FLAG_MODIFIER) {
+		spa_pod_builder_prop(builder,
+			SPA_FORMAT_VIDEO_modifier,	SPA_POD_PROP_FLAG_MANDATORY);
+		spa_pod_builder_long(builder,           info->modifier);
+	}
 	return (struct spa_pod*)spa_pod_builder_pop(builder, &f);
 }
 
diff --git a/spa/include/spa/param/video/raw-utils.h b/spa/include/spa/param/video/raw-utils.h
index 22d4a8a14..65c96724f 100644
--- a/spa/include/spa/param/video/raw-utils.h
+++ b/spa/include/spa/param/video/raw-utils.h
@@ -68,9 +68,11 @@ spa_format_video_raw_build(struct spa_pod_builder *builder, uint32_t id,
 	if (info->framerate.denom != 0)
 		spa_pod_builder_add(builder,
 			SPA_FORMAT_VIDEO_framerate,	SPA_POD_Fraction(&info->framerate), 0);
-	if (info->modifier != 0 || info->flags & SPA_VIDEO_FLAG_MODIFIER)
-		spa_pod_builder_add(builder,
-			SPA_FORMAT_VIDEO_modifier,	SPA_POD_Long(info->modifier), 0);
+	if (info->modifier != 0 || info->flags & SPA_VIDEO_FLAG_MODIFIER) {
+		spa_pod_builder_prop(builder,
+			SPA_FORMAT_VIDEO_modifier,	SPA_POD_PROP_FLAG_MANDATORY);
+		spa_pod_builder_long(builder,           info->modifier);
+	}
 	if (info->max_framerate.denom != 0)
 		spa_pod_builder_add(builder,
 			SPA_FORMAT_VIDEO_maxFramerate,	SPA_POD_Fraction(info->max_framerate), 0);