diff --git a/src/parsing/uncC.js b/src/parsing/uncC.js
index 18ad6754..955ddf8e 100644
--- a/src/parsing/uncC.js
+++ b/src/parsing/uncC.js
@@ -1,6 +1,6 @@
 BoxParser.createFullBoxCtor("uncC", function(stream) {
     var i;
-    this.profile = stream.readUint32();
+    this.profile = stream.readString(4);
     if (this.version == 1) {
         // Nothing - just the profile
     } else if (this.version == 0) {