diff --git a/demboyz/demotypes.h b/demboyz/demotypes.h
index e7472aa..bc50984 100644
--- a/demboyz/demotypes.h
+++ b/demboyz/demotypes.h
@@ -53,8 +53,6 @@ enum
     dem_datatables,
     // end of time.
     dem_stop,
-    // a blob of binary data understood by a callback function
-    dem_customdata,
 
     dem_stringtables,
 
diff --git a/demboyz/demreader.cpp b/demboyz/demreader.cpp
index 70db6c3..c2b73ae 100644
--- a/demboyz/demreader.cpp
+++ b/demboyz/demreader.cpp
@@ -145,9 +145,6 @@ void DemoReader::ProcessDem(void* inputFp, IDemoWriter* writer)
         case dem_stop:
             // TODO assert frame and tick numbers
             break;
-        case dem_customdata:
-            reader.ReadRawData(nullptr, 0);
-            break;
         case dem_stringtables:
             reader.ReadRawData(nullptr, 0);
             break;