diff --git a/src/parsing/cmpd.js b/src/parsing/cmpd.js
index edd195c0..9c839765 100644
--- a/src/parsing/cmpd.js
+++ b/src/parsing/cmpd.js
@@ -1,9 +1,9 @@
 BoxParser.createBoxCtor("cmpd", function(stream) {
-	this.component_count = stream.readUint16();
+	this.component_count = stream.readUint32();
 	this.component_types = [];
 	this.component_type_urls = [];
 	for (i = 0; i < this.component_count; i++) {
-		var component_type = stream.readUint32();
+		var component_type = stream.readUint16();
 		this.component_types.push(component_type);
 		if (component_type >= 0x8000) {
 			this.component_type_urls.push(stream.readCString());