diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index dfb055b930..830eec0e95 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -25,6 +25,8 @@
  * H.263 decoder.
  */
 
+#define UNCHECKED_BITSTREAM_READER 1
+
 #include "libavutil/cpu.h"
 #include "internal.h"
 #include "avcodec.h"
diff --git a/libavcodec/ituh263dec.c b/libavcodec/ituh263dec.c
index 69e7ab9c99..21365a673e 100644
--- a/libavcodec/ituh263dec.c
+++ b/libavcodec/ituh263dec.c
@@ -27,6 +27,8 @@
  * h263 decoder.
  */
 
+#define UNCHECKED_BITSTREAM_READER 1
+
 //#define DEBUG
 #include <limits.h>