diff --git a/cpp/src/arrow/io/type_fwd.h b/cpp/src/arrow/io/type_fwd.h
index a11c1a1a70f25..a1b9e626bba28 100644
--- a/cpp/src/arrow/io/type_fwd.h
+++ b/cpp/src/arrow/io/type_fwd.h
@@ -51,7 +51,6 @@ ARROW_EXPORT int GetIOThreadPoolCapacity();
 /// The current number is returned by GetIOThreadPoolCapacity().
 ARROW_EXPORT Status SetIOThreadPoolCapacity(int threads);
 
-class CacheOptions;
 class FileInterface;
 class Seekable;
 class Writable;