diff --git a/src/converters/calibre.ts b/src/converters/calibre.ts
index 4edf63e..8ebdbd1 100644
--- a/src/converters/calibre.ts
+++ b/src/converters/calibre.ts
@@ -39,6 +39,7 @@ export const properties = {
       "fb2",
       "html",
       "htmlz",
+      "kepub.epub",
       "lit",
       "lrf",
       "mobi",
@@ -65,20 +66,24 @@ export async function convert(
   options?: unknown,
 ): Promise<string> {
   return new Promise((resolve, reject) => {
-    execFile("ebook-convert", [filePath, targetPath], (error, stdout, stderr) => {
-      if (error) {
-        reject(`error: ${error}`);
-      }
+    execFile(
+      "ebook-convert",
+      [filePath, targetPath],
+      (error, stdout, stderr) => {
+        if (error) {
+          reject(`error: ${error}`);
+        }
 
-      if (stdout) {
-        console.log(`stdout: ${stdout}`);
-      }
+        if (stdout) {
+          console.log(`stdout: ${stdout}`);
+        }
 
-      if (stderr) {
-        console.error(`stderr: ${stderr}`);
-      }
+        if (stderr) {
+          console.error(`stderr: ${stderr}`);
+        }
 
-      resolve("Done");
-    });
+        resolve("Done");
+      },
+    );
   });
 }