diff --git a/libavcodec/magicyuv.c b/libavcodec/magicyuv.c
index 3573db0f0a..d813f20920 100644
--- a/libavcodec/magicyuv.c
+++ b/libavcodec/magicyuv.c
@@ -299,7 +299,7 @@ static int magy_decode_slice(AVCodecContext *avctx, void *tdata,
                 return ret;
 
             for (k = 0; k < height; k++)
-                READ_PLANE(dst, i, 1, 5)
+                READ_PLANE(dst, i, 1, 7)
         }
 
         switch (pred) {