diff --git a/entries/all-boxes.ts b/entries/all-boxes.ts
index c468da0b..ad26e44d 100644
--- a/entries/all-boxes.ts
+++ b/entries/all-boxes.ts
@@ -10,6 +10,7 @@ export * from '#/boxes/clap';
 export * from '#/boxes/clli';
 export * from '#/boxes/cmex';
 export * from '#/boxes/cmin';
+export * from '#/boxes/cmpC';
 export * from '#/boxes/cmpd';
 export * from '#/boxes/co64';
 export * from '#/boxes/CoLL';
diff --git a/src/boxes/cmpC.ts b/src/boxes/cmpC.ts
new file mode 100644
index 00000000..f6d6895f
--- /dev/null
+++ b/src/boxes/cmpC.ts
@@ -0,0 +1,18 @@
+import { FullBox } from '#/box';
+import type { MultiBufferStream } from '#/buffer';
+
+export class cmpCBox extends FullBox {
+  static override readonly fourcc = 'cmpC' as const;
+  box_name = 'CompressionConfigurationBox' as const;
+
+  version: number;
+  flags: number;
+  compression_type: string;
+  compressed_unit_type: number;
+
+  parse(stream: MultiBufferStream) {
+    this.parseFullHeader(stream);
+    this.compression_type = stream.readString(4);
+    this.compressed_unit_type = stream.readUint8();
+  }
+}