diff --git a/src/index.tsx b/src/index.tsx
index 46e241e..3e74d28 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -81,7 +81,7 @@ export default class EIdReader {
     return EIdReaderNativeModule.openNfcSettings();
   }
 
-  static imageDataUrlToJpegDataUrl(dataUrl: string): Promise<string> {
+  static imageDataUrlToJpegDataUrl(dataUrl: string): string {
     return EIdReaderNativeModule.imageDataUrlToJpegDataUrl(dataUrl);
   }