diff --git a/demboyz/netmessages/netcontants.h b/demboyz/netmessages/netcontants.h
index 45df39a..0d35ee5 100644
--- a/demboyz/netmessages/netcontants.h
+++ b/demboyz/netmessages/netcontants.h
@@ -31,7 +31,9 @@ enum constants
 
     DELTASIZE_BITS = 20,             // must be: 2^DELTASIZE_BITS > (NET_MAX_PAYLOAD * 8)
     EVENT_INDEX_BITS = 8,
-    MAX_SOUND_INDEX_BITS = 13,
+
+    MAX_SOUND_INDEX_BITS_OLD = 13,
+    MAX_SOUND_INDEX_BITS = 14,
 
     MAX_USER_MSG_DATA = 255,
 
diff --git a/demboyz/netmessages/svc_prefetch.cpp b/demboyz/netmessages/svc_prefetch.cpp
index 720eb8c..68465e6 100644
--- a/demboyz/netmessages/svc_prefetch.cpp
+++ b/demboyz/netmessages/svc_prefetch.cpp
@@ -8,13 +8,27 @@ namespace NetHandlers
     bool SVC_Prefetch_BitRead_Internal(bf_read& bitbuf, SourceGameContext& context, NetMsg::SVC_Prefetch* data)
     {
         data->type = NetMsg::SVC_Prefetch::SOUND;
-        data->soundIndex = bitbuf.ReadUBitLong(MAX_SOUND_INDEX_BITS);
+        if (context.protocol > 23)
+        {
+            data->soundIndex = bitbuf.ReadUBitLong(MAX_SOUND_INDEX_BITS);
+        }
+        else
+        {
+            data->soundIndex = bitbuf.ReadUBitLong(MAX_SOUND_INDEX_BITS_OLD);
+        }
         return !bitbuf.IsOverflowed();
     }
 
     bool SVC_Prefetch_BitWrite_Internal(bf_write& bitbuf, SourceGameContext& context, NetMsg::SVC_Prefetch* data)
     {
-        bitbuf.WriteUBitLong(data->soundIndex, MAX_SOUND_INDEX_BITS);
+        if (context.protocol > 23)
+        {
+            bitbuf.WriteUBitLong(data->soundIndex, MAX_SOUND_INDEX_BITS);
+        }
+        else
+        {
+            bitbuf.WriteUBitLong(data->soundIndex, MAX_SOUND_INDEX_BITS_OLD);
+        }
         return !bitbuf.IsOverflowed();
     }