diff --git a/core/common/src/files/FileSystem.kt b/core/common/src/files/FileSystem.kt
index 46c40af6..7eb2b76c 100644
--- a/core/common/src/files/FileSystem.kt
+++ b/core/common/src/files/FileSystem.kt
@@ -210,7 +210,7 @@ public class FileMetadata(
 /**
  * Signals an I/O operation's failure due to a missing file or directory.
  */
-public expect class FileNotFoundException(message: String?) : IOException
+public expect open class FileNotFoundException(message: String?) : IOException
 
 internal const val WindowsPathSeparator: Char = '\\'
 internal const val UnixPathSeparator: Char = '/'