diff --git a/lib/bundle.js b/lib/bundle.js
index e6bb2d6..bfd84b8 100644
--- a/lib/bundle.js
+++ b/lib/bundle.js
@@ -9,7 +9,7 @@ function toArrayBuffer(buffer) {
   return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
 }
 
-async function findFontFiles(dir) {
+async function findFontFiles(dir, baseDir = dir) {
   const fontFiles = [];
   const entries = await fs.readdir(dir, { withFileTypes: true });
 
@@ -17,12 +17,14 @@ async function findFontFiles(dir) {
     const fullPath = path.join(dir, entry.name);
     
     if (entry.isDirectory()) {
-      const subFiles = await findFontFiles(fullPath);
+      const subFiles = await findFontFiles(fullPath, baseDir);
       fontFiles.push(...subFiles);
     } else if (entry.isFile()) {
       const ext = path.extname(entry.name).toLowerCase();
       if (FONT_EXTENSIONS.has(ext)) {
-        fontFiles.push({ path: fullPath, name: entry.name });
+        // Store relative path from base input directory
+        const relativePath = path.relative(baseDir, fullPath);
+        fontFiles.push({ path: fullPath, relativePath });
       }
     }
   }
@@ -36,9 +38,9 @@ export async function createBundle(inputDir, outputPath, options = {}) {
   const fontFiles = await findFontFiles(inputDir);
   const availableFonts = [];
 
-  for (const { path: fontPath, name } of fontFiles) {
+  for (const { path: fontPath, relativePath } of fontFiles) {
     const fileBuffer = await fs.readFile(fontPath);
-    const result = await processFont(toArrayBuffer(fileBuffer), name);
+    const result = await processFont(toArrayBuffer(fileBuffer), relativePath);
 
     if (Array.isArray(result)) {
       availableFonts.push(...result);
diff --git a/test/bundle.test.js b/test/bundle.test.js
index 4830e75..c696f8c 100644
--- a/test/bundle.test.js
+++ b/test/bundle.test.js
@@ -74,4 +74,25 @@ describe('createBundle', () => {
     
     expect(result.fontsProcessed).toBe(1);
   });
+
+  it('should include subdirectory in filePath for nested fonts', async () => {
+    // Create nested structure with known subdirectory
+    const nestedDir = path.join(__dirname, 'output', 'nested-path-test');
+    const subDir = path.join(nestedDir, 'my-subfolder');
+    await fs.mkdir(subDir, { recursive: true });
+    await fs.copyFile(
+      path.join(fixturesDir, 'Anton-Regular.ttf'),
+      path.join(subDir, 'Anton-Regular.ttf')
+    );
+    
+    const nestedOutput = path.join(__dirname, 'output', 'nested-path-fonts.json');
+    await createBundle(nestedDir, nestedOutput);
+    
+    const content = await fs.readFile(nestedOutput, 'utf-8');
+    const json = JSON.parse(content);
+    
+    // filePath should include the subdirectory
+    const font = json.availableFonts[0];
+    expect(font.filePath).toBe('my-subfolder/Anton-Regular.ttf');
+  });
 });