diff --git a/src/plugins/anonymiseFileNames.ts b/src/plugins/anonymiseFileNames.ts
index 37fd18fd0..9e69d7a93 100644
--- a/src/plugins/anonymiseFileNames.ts
+++ b/src/plugins/anonymiseFileNames.ts
@@ -26,6 +26,8 @@ const enum Methods {
     Timestamp,
 }
 
+const tarExtMatcher = /\.tar\.\w+$/;
+
 export default definePlugin({
     name: "AnonymiseFileNames",
     authors: [Devs.obscurity],
@@ -67,7 +69,8 @@ export default definePlugin({
 
     anonymise(file: string) {
         let name = "image";
-        const extIdx = file.lastIndexOf(".");
+        const tarMatch = tarExtMatcher.exec(file);
+        const extIdx = tarMatch?.index ?? file.lastIndexOf(".");
         const ext = extIdx !== -1 ? file.slice(extIdx) : "";
 
         switch (Settings.plugins.AnonymiseFileNames.method) {