diff --git a/libswscale/format.c b/libswscale/format.c
index c4c4142fc6..e4b9b264e5 100644
--- a/libswscale/format.c
+++ b/libswscale/format.c
@@ -757,8 +757,6 @@ static int fmt_shift(enum AVPixelFormat fmt)
     case AV_PIX_FMT_YUV444P10MSBLE:
     case AV_PIX_FMT_GBRP10MSBBE:
     case AV_PIX_FMT_GBRP10MSBLE:
-    case AV_PIX_FMT_GRAY10MSBBE:
-    case AV_PIX_FMT_GRAY10MSBLE:
         return 6;
     case AV_PIX_FMT_P012BE:
     case AV_PIX_FMT_P012LE:
@@ -778,8 +776,6 @@ static int fmt_shift(enum AVPixelFormat fmt)
     case AV_PIX_FMT_YUV444P12MSBLE:
     case AV_PIX_FMT_GBRP12MSBBE:
     case AV_PIX_FMT_GBRP12MSBLE:
-    case AV_PIX_FMT_GRAY12MSBBE:
-    case AV_PIX_FMT_GRAY12MSBLE:
         return 4;
     }