diff --git a/Sources/LNPopupUI/LNPopupUI.swift b/Sources/LNPopupUI/LNPopupUI.swift
index bc99111..b2f7312 100644
--- a/Sources/LNPopupUI/LNPopupUI.swift
+++ b/Sources/LNPopupUI/LNPopupUI.swift
@@ -9,9 +9,11 @@ import SwiftUI
 import LNSwiftUIUtils
 @_exported import LNPopupController
 
-@MainActor
 @available(iOS 14.0, *)
 public extension ToolbarItemPlacement {
+#if swift(>=6.0)
+	@MainActor
+#endif
 	static let popupBar: ToolbarItemPlacement = .bottomBar
 }
 
diff --git a/Sources/LNPopupUI/Private/LNPopupEnvironment.swift b/Sources/LNPopupUI/Private/LNPopupEnvironment.swift
index 4fce36e..6443cce 100644
--- a/Sources/LNPopupUI/Private/LNPopupEnvironment.swift
+++ b/Sources/LNPopupUI/Private/LNPopupEnvironment.swift
@@ -8,7 +8,9 @@
 import SwiftUI
 import LNPopupController
 
+#if swift(>=6.0)
 @MainActor
+#endif
 internal final class LNPopupEnvironmentConsumer<T> {
 	private let wrapped: T
 	private unowned var consumer: AnyObject? = nil