diff --git a/src/dispextern.h b/src/dispextern.h
index 4a7a790ad7e..4cd9c42cc0f 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -2431,6 +2431,10 @@ struct image
      if necessary.  */
   unsigned long background;
 
+  /* Foreground and background colors of the frame on which the image
+     is created.  */
+  unsigned long frame_foreground, frame_background;
+
   /* True if this image has a `transparent' background -- that is, is
      uses an image mask.  The accessor macro for this is
      `IMAGE_BACKGROUND_TRANSPARENT'.  */