diff --git a/tools/deploy/index.ts b/tools/deploy/index.ts
index 7d69d658..9490b655 100644
--- a/tools/deploy/index.ts
+++ b/tools/deploy/index.ts
@@ -30,11 +30,10 @@ program
 
         const aq = new script.ActionQueue;
         
-        for (const file of files) {
-            const src = pathlib.path(file);
+        for (const src of files) {
             const output = script.runOnFile(scr, src);
-            const dst = pathlib.join(outputDir, output);
-            aq.copy(pathlib.format(src), pathlib.format(dst));
+            const dst = nodePath.join(outputDir, output);
+            aq.copy(src, dst);
         }
         
         if (act) {
diff --git a/tools/deploy/script.test.ts b/tools/deploy/script.test.ts
index 27100c1c..d6e14eb8 100644
--- a/tools/deploy/script.test.ts
+++ b/tools/deploy/script.test.ts
@@ -13,9 +13,8 @@ test('aq', () => {
 
 test('runOnFile', () => {
     const scr = new script.Script('({name: "25"})', 'expr');
-    const src = pathlib.path('/foo/bar/pikachu.png');
-    const dst = script.runOnFile(scr, src);
-    expect(dst).toEqual(pathlib.path('25.png'));
+    const dst = script.runOnFile(scr, '/foo/bar/pikachu.png');
+    expect(dst).toEqual('25.png');
 });
 
 test('run identity', () => {
diff --git a/tools/deploy/script.ts b/tools/deploy/script.ts
index 0e9ed378..fed390e9 100644
--- a/tools/deploy/script.ts
+++ b/tools/deploy/script.ts
@@ -101,18 +101,19 @@ function makeEnv(srcDir : string, queue: ActionQueue) {
     }
 }
 
-export function runOnFile(scr : Script, src : pathlib.Path) : pathlib.Path {
-    const input = pathlib.update(src, {dir: ""});
+export function runOnFile(scr : Script, src : string) : string {
+    const input = pathlib.path(src, {dir: ""});
     const result = scr.runInNewContext({
         __proto__: ENV_PROTO,
         path: input,
         ...input
     });
     if (result === undefined) {
-        throw new Error(`undefined output on ${pathlib.format(src)}`);
+        throw new Error(`undefined output on ${src}`);
     }
-    const output = pathlib.path(input, result);
-    return output;
+    const output = pathlib.update(input, result);
+    const dst = pathlib.format(output);
+    return dst;
 }
 
 export function run(scr : Script, srcDir : string, queue : ActionQueue) {