diff --git a/dist/restore/index.js b/dist/restore/index.js
index 8005768..6882650 100644
--- a/dist/restore/index.js
+++ b/dist/restore/index.js
@@ -87392,6 +87392,7 @@ async function run() {
                     const restoreJson = external_path_default().join(config_CARGO_HOME, "incremental-restore.json");
                     const restoreString = await external_fs_default().promises.readFile(restoreJson, "utf8");
                     const restoreData = JSON.parse(restoreString);
+                    lib_core.debug(`restoreData: ${JSON.stringify(restoreData)}`);
                     if (restoreData.roots.length == 0) {
                         throw new Error("No incremental roots found");
                     }
diff --git a/dist/save/index.js b/dist/save/index.js
index d21f420..cee0247 100644
--- a/dist/save/index.js
+++ b/dist/save/index.js
@@ -87340,8 +87340,11 @@ async function rmRF(dirName) {
 
 
 async function saveMtimes(targetDirs) {
-    let times = new Map();
-    let stack = new Array();
+    let data = {
+        roots: [],
+        times: {},
+    };
+    let stack = [];
     // Collect all the incremental files
     for (const dir of targetDirs) {
         for (const maybeProfile of await external_fs_default().promises.readdir(dir)) {
@@ -87353,7 +87356,7 @@ async function saveMtimes(targetDirs) {
         }
     }
     // Save the stack as the roots - we cache these directly
-    let roots = stack.slice();
+    data.roots = stack.slice();
     while (stack.length > 0) {
         const dirName = stack.pop();
         const dir = await external_fs_default().promises.opendir(dirName);
@@ -87364,11 +87367,11 @@ async function saveMtimes(targetDirs) {
             else {
                 const fileName = external_path_default().join(dirName, dirent.name);
                 const { mtime } = await external_fs_default().promises.stat(fileName);
-                times.set(fileName, mtime.getTime());
+                data.times[fileName] = mtime.getTime();
             }
         }
     }
-    return { roots, times: times };
+    return data;
 }
 
 ;// CONCATENATED MODULE: ./src/save.ts
diff --git a/src/incremental.ts b/src/incremental.ts
index 2738179..4e8865a 100644
--- a/src/incremental.ts
+++ b/src/incremental.ts
@@ -8,13 +8,18 @@ import fs from "fs";
 import path from "path";
 
 export type MtimeData = {
-  roots: Array<string>,
-  times: Map<string, number>
+  roots: string[],
+  times: {
+    [key: string]: number
+  }
 };
 
 export async function saveMtimes(targetDirs: string[]): Promise<MtimeData> {
-  let times = new Map<string, number>();
-  let stack = new Array<string>();
+  let data: MtimeData = {
+    roots: [],
+    times: {},
+  };
+  let stack: string[] = [];
 
   // Collect all the incremental files
   for (const dir of targetDirs) {
@@ -28,7 +33,7 @@ export async function saveMtimes(targetDirs: string[]): Promise<MtimeData> {
   }
 
   // Save the stack as the roots - we cache these directly
-  let roots = stack.slice();
+  data.roots = stack.slice();
 
   while (stack.length > 0) {
     const dirName = stack.pop()!;
@@ -40,10 +45,10 @@ export async function saveMtimes(targetDirs: string[]): Promise<MtimeData> {
       } else {
         const fileName = path.join(dirName, dirent.name);
         const { mtime } = await fs.promises.stat(fileName);
-        times.set(fileName, mtime.getTime());
+        data.times[fileName] = mtime.getTime();
       }
     }
   }
 
-  return { roots, times: times };
+  return data;
 }
diff --git a/src/restore.ts b/src/restore.ts
index dcd1caa..78e7975 100644
--- a/src/restore.ts
+++ b/src/restore.ts
@@ -71,6 +71,8 @@ async function run() {
           const restoreString = await fs.promises.readFile(restoreJson, "utf8");
           const restoreData: MtimeData = JSON.parse(restoreString);
 
+          core.debug(`restoreData: ${JSON.stringify(restoreData)}`);
+
           if (restoreData.roots.length == 0) {
             throw new Error("No incremental roots found");
           }