diff --git a/dist/esbuild-plugin.js b/dist/esbuild-plugin.js
index 44209e3..e28de4b 100644
--- a/dist/esbuild-plugin.js
+++ b/dist/esbuild-plugin.js
@@ -75,19 +75,23 @@ const hanamiEsbuild = (options = { ...defaults }) => {
                 };
                 const processAssetDirectory = (pattern, inputs, options) => {
                     const dirPath = path.dirname(pattern);
-                    const files = fs.readdirSync(dirPath);
+                    const files = fs.readdirSync(dirPath, { recursive: true });
                     const assets = [];
                     files.forEach((file) => {
-                        const srcPath = path.join(dirPath, file);
+                        const srcPath = path.join(dirPath, file.toString());
                         // Skip if the file is already processed by esbuild
                         if (inputs.hasOwnProperty(srcPath)) {
                             return;
                         }
+                        // Skip directories and any other non-files
+                        if (!fs.statSync(srcPath).isFile()) {
+                            return;
+                        }
                         const fileHash = calculateHash(fs.readFileSync(srcPath), options.hash);
                         const fileExtension = path.extname(srcPath);
                         const baseName = path.basename(srcPath, fileExtension);
                         const destFileName = [baseName, fileHash].filter((item) => item !== null).join("-") + fileExtension;
-                        const destPath = path.join(options.destDir, path.relative(dirPath, srcPath).replace(file, destFileName));
+                        const destPath = path.join(options.destDir, path.relative(dirPath, srcPath).replace(path.basename(file.toString()), destFileName));
                         if (fs.lstatSync(srcPath).isDirectory()) {
                             assets.push(...processAssetDirectory(destPath, inputs, options));
                         }
diff --git a/src/esbuild-plugin.ts b/src/esbuild-plugin.ts
index a59a427..0875313 100644
--- a/src/esbuild-plugin.ts
+++ b/src/esbuild-plugin.ts
@@ -121,17 +121,22 @@ const hanamiEsbuild = (options: PluginOptions = { ...defaults }): Plugin => {
           options: PluginOptions,
         ): string[] => {
           const dirPath = path.dirname(pattern);
-          const files = fs.readdirSync(dirPath);
+          const files = fs.readdirSync(dirPath, { recursive: true });
           const assets: string[] = [];
 
           files.forEach((file) => {
-            const srcPath = path.join(dirPath, file);
+            const srcPath = path.join(dirPath, file.toString());
 
             // Skip if the file is already processed by esbuild
             if (inputs.hasOwnProperty(srcPath)) {
               return;
             }
 
+            // Skip directories and any other non-files
+            if (!fs.statSync(srcPath).isFile()) {
+              return;
+            }
+
             const fileHash = calculateHash(fs.readFileSync(srcPath), options.hash);
             const fileExtension = path.extname(srcPath);
             const baseName = path.basename(srcPath, fileExtension);
@@ -139,7 +144,7 @@ const hanamiEsbuild = (options: PluginOptions = { ...defaults }): Plugin => {
               [baseName, fileHash].filter((item) => item !== null).join("-") + fileExtension;
             const destPath = path.join(
               options.destDir,
-              path.relative(dirPath, srcPath).replace(file, destFileName),
+              path.relative(dirPath, srcPath).replace(path.basename(file.toString()), destFileName),
             );
 
             if (fs.lstatSync(srcPath).isDirectory()) {
diff --git a/test/fixtures/todo/slices/admin/assets/images/nested/image.jpg b/test/fixtures/todo/slices/admin/assets/images/nested/image.jpg
new file mode 100644
index 0000000..9340688
Binary files /dev/null and b/test/fixtures/todo/slices/admin/assets/images/nested/image.jpg differ
diff --git a/test/hanami-assets.test.ts b/test/hanami-assets.test.ts
index ce53203..b0ad447 100644
--- a/test/hanami-assets.test.ts
+++ b/test/hanami-assets.test.ts
@@ -146,6 +146,10 @@ describe("hanami-assets", () => {
         url: "/assets/logo-C1EF77E4.png",
         sri: ["sha384-7q5x+ZjZrCoWwyV0BTyc8HUPf1xr+n9l77gwxmwywPWSe0PtopZj1T8NTUPFo0FI"],
       },
+      "nested/image.jpg": {
+        url: "/assets/nested/image-83509E65.jpg",
+        sri: ["sha384-M7QyKTUfzyVWNC4FoMYq0ypu7LDifAYWEtXRT5d6M3Prpau9t5wavW1216HhvCJc"],
+      },
     });
   });