diff --git a/Sources/SakeCLI/SakeAppManager/SakeAppManager.swift b/Sources/SakeCLI/SakeAppManager/SakeAppManager.swift
index e02f99f..fdcc5cd 100644
--- a/Sources/SakeCLI/SakeAppManager/SakeAppManager.swift
+++ b/Sources/SakeCLI/SakeAppManager/SakeAppManager.swift
@@ -4,10 +4,17 @@ import SakeShared
 enum SakeAppManagerUnitializedMode {}
 enum SakeAppManagerInitializedMode {}
 
+#if swift(>=6.0)
 struct SakeAppManager<Mode>: ~Copyable {
     let fileHandle: SakeAppManagerFileHandle
     let commandExecutor: SakeAppManagerCommandExecutor
 }
+#else
+struct SakeAppManager<Mode> {
+    let fileHandle: SakeAppManagerFileHandle
+    let commandExecutor: SakeAppManagerCommandExecutor
+}
+#endif
 
 extension SakeAppManager {
     static func makeDefault(sakeAppPath: String) -> Self {