diff --git a/matroska/KaxContexts.h b/matroska/KaxContexts.h
index 46ab4e73..9c82094c 100644
--- a/matroska/KaxContexts.h
+++ b/matroska/KaxContexts.h
@@ -17,38 +17,16 @@ extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxMatroska;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxSegment;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxAttachments;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxAttached;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxFileDescription;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxFileName;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxMimeType;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxFileData;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxChapters;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCluster;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTags;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTag;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxBlockGroup;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxReferencePriority;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxReferenceBlock;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxReferenceVirtual;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCues;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxInfo;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxSeekHead;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTracks;
 extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackEntry;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackNumber;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackType;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackFlagEnabled;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackFlagDefault;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackFlagLacing;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackName;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackLanguage;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecID;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecPrivate;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecName;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecSettings;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecInfoURL;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecDownloadURL;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxCodecDecodeAll;
-extern const libebml::EbmlSemanticContext MATROSKA_DLL_API Context_KaxTrackOverlay;
 
 extern MATROSKA_DLL_API const libebml::EbmlSemanticContext & GetKaxGlobal_Context();