diff --git a/GliaWidgets/Public/Glia/Glia.OpaqueAuthentication.swift b/GliaWidgets/Public/Glia/Glia.OpaqueAuthentication.swift
index f655414cb..a76d0f45e 100644
--- a/GliaWidgets/Public/Glia/Glia.OpaqueAuthentication.swift
+++ b/GliaWidgets/Public/Glia/Glia.OpaqueAuthentication.swift
@@ -1,3 +1,5 @@
+import Foundation
+
 extension Glia {
     /// Entry point for Visitor authentication.
     public struct Authentication {