diff --git a/matroska/KaxSemantic.h b/matroska/KaxSemantic.h
index 79e94ccf..245b9156 100644
--- a/matroska/KaxSemantic.h
+++ b/matroska/KaxSemantic.h
@@ -254,9 +254,13 @@ DECLARE_MKX_UINTEGER(KaxTrackFlagLacing)
 };
 
 DECLARE_MKX_UINTEGER(KaxTrackMinCache)
+public:
+  filepos_t RenderData(IOCallback & output, bool bForceRender, bool bSaveDefault) override;
 };
 
 DECLARE_MKX_UINTEGER(KaxTrackMaxCache)
+public:
+  filepos_t RenderData(IOCallback & output, bool bForceRender, bool bSaveDefault) override;
 };
 
 DECLARE_MKX_UINTEGER(KaxTrackDefaultDuration)
diff --git a/src/KaxSemantic.cpp b/src/KaxSemantic.cpp
index af4ddd66..34935c48 100644
--- a/src/KaxSemantic.cpp
+++ b/src/KaxSemantic.cpp
@@ -225,8 +225,8 @@ DEFINE_SEMANTIC_ITEM(false, true, KaxFlagTextDescriptions)
 DEFINE_SEMANTIC_ITEM(false, true, KaxFlagOriginal)
 DEFINE_SEMANTIC_ITEM(false, true, KaxFlagCommentary)
 DEFINE_SEMANTIC_ITEM(true, true, KaxTrackFlagLacing)
-DEFINE_SEMANTIC_ITEM(true, true, KaxTrackMinCache)
-DEFINE_SEMANTIC_ITEM(false, true, KaxTrackMaxCache)
+DEFINE_SEMANTIC_ITEM(true, true, KaxTrackMinCache) // not supported
+DEFINE_SEMANTIC_ITEM(false, true, KaxTrackMaxCache) // not supported
 DEFINE_SEMANTIC_ITEM(false, true, KaxTrackDefaultDuration)
 DEFINE_SEMANTIC_ITEM(false, true, KaxTrackDefaultDecodedFieldDuration)
 DEFINE_SEMANTIC_ITEM(true, true, KaxTrackTimecodeScale)
@@ -832,6 +832,16 @@ filepos_t KaxEncryptedBlock::RenderData(IOCallback & /* output */, bool /* bForc
   return 0;
 }
 
+filepos_t KaxTrackMinCache::RenderData(IOCallback & /* output */, bool /* bForceRender */, bool /* bSaveDefault */) {
+  assert(false); // no you are not allowed to use this element !
+  return 0;
+}
+
+filepos_t KaxTrackMaxCache::RenderData(IOCallback & /* output */, bool /* bForceRender */, bool /* bSaveDefault */) {
+  assert(false); // no you are not allowed to use this element !
+  return 0;
+}
+
 filepos_t KaxTrackTimecodeScale::RenderData(IOCallback & /* output */, bool /* bForceRender */, bool /* bSaveDefault */) {
   assert(false); // no you are not allowed to use this element !
   return 0;