diff --git a/pydenticon/__init__.py b/pydenticon/__init__.py
index 0edfdb02d25ee603310ffa465273550e746eda06..f499988266fc099ad9aa49ab50e8d259440d7dc8 100644
--- a/pydenticon/__init__.py
+++ b/pydenticon/__init__.py
@@ -246,6 +246,9 @@ class Generator(object):
         # Set-up a stream where image will be saved.
         stream = BytesIO()
 
+        if image_format.upper() == "JPEG":
+            image = image.convert(mode="RGB")
+
         # Save the image to stream.
         try:
             image.save(stream, format=image_format, optimize=True)