diff --git a/Sources/SwiftOptions/CMakeLists.txt b/Sources/SwiftOptions/CMakeLists.txt
index 8ba974cbc..c62626826 100644
--- a/Sources/SwiftOptions/CMakeLists.txt
+++ b/Sources/SwiftOptions/CMakeLists.txt
@@ -11,7 +11,6 @@ add_library(SwiftOptions
   Option.swift
   OptionTable.swift
   ParsedOptions.swift
-  ExtraOptions.swift
   OptionParsing.swift
   Options.swift
   PrefixTrie.swift)