diff --git a/decoder/ih264d_defs.h b/decoder/ih264d_defs.h
index 0682339..d6e3029 100644
--- a/decoder/ih264d_defs.h
+++ b/decoder/ih264d_defs.h
@@ -107,6 +107,9 @@
 /* For 420SP */
 #define YUV420SP_FACTOR 2
 
+/*To prevent buffer overflow access; in case the size of nal unit is
+ *  greater than the allocated buffer size*/
+#define EXTRA_BS_OFFSET 16*16*2
 
 /**
  ***************************************************************************