diff --git a/modules/processing.py b/modules/processing.py
index 90ae249a4..7fc282cfd 100644
--- a/modules/processing.py
+++ b/modules/processing.py
@@ -1500,7 +1500,7 @@ class StableDiffusionProcessingImg2Img(StableDiffusionProcessing):
             if image_mask is not None:
                 if self.soft_inpainting is not None:
                     # We apply the masks AFTER to adjust mask based on changed content.
-                    self.overlay_images.append(image)
+                    self.overlay_images.append(image.convert('RGBA'))
                     self.masks_for_overlay.append(image_mask)
                 else:
                     image_masked = Image.new('RGBa', (image.width, image.height))