diff --git a/modules/product_image/product.py b/modules/product_image/product.py
index 2819b7077a..f205d3821c 100644
--- a/modules/product_image/product.py
+++ b/modules/product_image/product.py
@@ -128,7 +128,8 @@ class Product(
 class _ImageMixin:
     __slots__ = ()
     image = fields.Binary(
-        "Image", file_id=file_id, store_prefix=store_prefix, required=True)
+        "Image", required=True, filename_ext='jpg',
+        file_id=file_id, store_prefix=store_prefix)
     image_id = fields.Char("Image ID", readonly=True)