diff --git a/frappe/utils/data.py b/frappe/utils/data.py
index 1a4604ffff..7f3d7c0624 100644
--- a/frappe/utils/data.py
+++ b/frappe/utils/data.py
@@ -771,6 +771,8 @@ def image_to_base64(image, extn):
 	from io import BytesIO
 
 	buffered = BytesIO()
+	if extn.lower() == 'jpg':
+		extn = 'JPEG'
 	image.save(buffered, extn)
 	img_str = base64.b64encode(buffered.getvalue())
 	return img_str