diff --git a/Core/Sources/Core/BinaryDiskCache.swift b/Core/Sources/Core/BinaryDiskCache.swift
index 11373c37f..b3eb9185f 100644
--- a/Core/Sources/Core/BinaryDiskCache.swift
+++ b/Core/Sources/Core/BinaryDiskCache.swift
@@ -8,9 +8,7 @@
 
 import Foundation
 
-// Thread safety is up to the caller.
-
-public struct BinaryDiskCache {
+public actor BinaryDiskCache {
 
 	public let folder: String