diff --git a/libavcodec/hevcdec.h b/libavcodec/hevcdec.h
index aab816791e..94609e4699 100644
--- a/libavcodec/hevcdec.h
+++ b/libavcodec/hevcdec.h
@@ -75,7 +75,7 @@
 #define IS_IDR(s) ((s)->nal_unit_type == HEVC_NAL_IDR_W_RADL || (s)->nal_unit_type == HEVC_NAL_IDR_N_LP)
 #define IS_BLA(s) ((s)->nal_unit_type == HEVC_NAL_BLA_W_RADL || (s)->nal_unit_type == HEVC_NAL_BLA_W_LP || \
                    (s)->nal_unit_type == HEVC_NAL_BLA_N_LP)
-#define IS_IRAP(s) ((s)->nal_unit_type >= 16 && (s)->nal_unit_type <= 23)
+#define IS_IRAP(s) ((s)->nal_unit_type >= HEVC_NAL_BLA_W_LP && (s)->nal_unit_type <= HEVC_NAL_RSV_IRAP_VCL23)
 
 enum RPSType {
     ST_CURR_BEF = 0,