diff --git a/libavcodec/a64multienc.c b/libavcodec/a64multienc.c
index d4659966aa..fa1209e5c5 100644
--- a/libavcodec/a64multienc.c
+++ b/libavcodec/a64multienc.c
@@ -370,7 +370,7 @@ AVCodec a64multi_encoder = {
     .init           = a64multi_init_encoder,
     .encode         = a64multi_encode_frame,
     .close          = a64multi_close_encoder,
-    .pix_fmts       = (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
+    .pix_fmts       = (const enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
     .long_name      = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),
     .capabilities   = CODEC_CAP_DELAY,
 };
@@ -383,7 +383,7 @@ AVCodec a64multi5_encoder = {
     .init           = a64multi_init_encoder,
     .encode         = a64multi_encode_frame,
     .close          = a64multi_close_encoder,
-    .pix_fmts       = (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
+    .pix_fmts       = (const enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
     .long_name      = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),
     .capabilities   = CODEC_CAP_DELAY,
 };