diff --git a/mp4-tree.js b/mp4-tree.js
index 4fa241a..185e227 100644
--- a/mp4-tree.js
+++ b/mp4-tree.js
@@ -89,7 +89,7 @@ class MP4Tree {
 		this.parse_into('vpcC', 12);
 		const profile = this.data.getUint8(this.idx).toString().padStart(2, "0");
 		const level = this.data.getUint8(this.idx + 1).toString();
-		const depth = (this.data.getUint8(this.idx + 2) & 0xf0).toString().padStart(2, "0");
+		const depth = (this.data.getUint8(this.idx + 2) >> 4).toString().padStart(2, "0");
 		this.codecs.push(["vp09", profile, level, depth].join('.'));
 	}