diff --git a/src/mux/anim_encode.c b/src/mux/anim_encode.c
index baf4f816..4b1a1120 100644
--- a/src/mux/anim_encode.c
+++ b/src/mux/anim_encode.c
@@ -514,7 +514,7 @@ typedef struct {
   FrameRectangle rect_lossy;     // Frame rectangle for lossy compression.
                                  // Could be smaller than 'rect_ll' as pixels
                                  // with small diffs can be ignored.
-  WebPPicture sub_frame_lossy;   // Sub-frame pic for lossless compression.
+  WebPPicture sub_frame_lossy;   // Sub-frame pic for lossy compression.
 } SubFrameParams;
 
 static int SubFrameParamsInit(SubFrameParams* const params,