diff --git a/source/Lib/CommonLib/TypeDef.h b/source/Lib/CommonLib/TypeDef.h
index e34f8cd35e26cb16baf09d8711bb51a82e878b4c..692348224adfad6bb1fe652016c8365bedc38d7f 100644
--- a/source/Lib/CommonLib/TypeDef.h
+++ b/source/Lib/CommonLib/TypeDef.h
@@ -1009,9 +1009,6 @@ enum NalUnitType
 
   NAL_UNIT_RESERVED_IRAP_VCL_11,
   NAL_UNIT_RESERVED_IRAP_VCL_12,
-#if JVET_P0124_MIXED_NALU
-  NAL_UNIT_RESERVED_VCL_15,
-#endif
 #if JVET_Q0117_PARAMETER_SETS_CLEANUP
   NAL_UNIT_DCI,                     // 13
 #else
diff --git a/source/Lib/DecoderLib/DecLib.cpp b/source/Lib/DecoderLib/DecLib.cpp
index 56e44261c1da3563879f643d35e42a70a53e3eb7..228334a4802b2279fe06340f76275c943fe46a77 100644
--- a/source/Lib/DecoderLib/DecLib.cpp
+++ b/source/Lib/DecoderLib/DecLib.cpp
@@ -2797,7 +2797,7 @@ void DecLib::xCheckMixedNalUnit(Slice* pcSlice, SPS *sps, InputNALUnit &nalu)
         {
           num1stSetSlice++;
         }
-        else if ((naluType >= NAL_UNIT_CODED_SLICE_TRAIL && naluType <= NAL_UNIT_RESERVED_VCL_15) || naluType == NAL_UNIT_CODED_SLICE_GDR)
+        else if ((naluType >= NAL_UNIT_CODED_SLICE_TRAIL && naluType <= NAL_UNIT_RESERVED_VCL_6) || naluType == NAL_UNIT_CODED_SLICE_GDR)
         {
           num2ndSetSlice++;
         }