diff --git a/Package.swift b/Package.swift
index 8683c4d..6e855ea 100644
--- a/Package.swift
+++ b/Package.swift
@@ -4,7 +4,6 @@ import PackageDescription
 
 let swiftSettings: [SwiftSetting] = [
     .enableExperimentalFeature("LifetimeDependence"),
-    .enableExperimentalFeature("CDecl"),
     .enableExperimentalFeature("InlineAlways"),
     .enableUpcomingFeature("InternalImportsByDefault"),
     .enableUpcomingFeature("MemberImportVisibility"),