diff --git a/libavcodec/cbs_mpeg2.c b/libavcodec/cbs_mpeg2.c
index 8a4da96a0a..54875c2e1c 100644
--- a/libavcodec/cbs_mpeg2.c
+++ b/libavcodec/cbs_mpeg2.c
@@ -54,7 +54,7 @@
         xui(width, name, current->name)
 
 #define marker_bit() do { \
-        av_unused int one = 1; \
+        av_unused uint32_t one; \
         CHECK(ff_cbs_read_unsigned(ctx, rw, 1, "marker_bit", &one, 1, 1)); \
     } while (0)