diff --git a/engine/common/net_chan.c b/engine/common/net_chan.c
index 2ec6f6d8..2f820849 100644
--- a/engine/common/net_chan.c
+++ b/engine/common/net_chan.c
@@ -302,7 +302,7 @@ Netchan_Setup
 called to open a channel to a remote system
 ==============
 */
-void Netchan_Setup( netsrc_t sock, netchan_t *chan, netadr_t adr, int qport, void *client, int (*pfnBlockSize)(void * ))
+void Netchan_Setup( netsrc_t sock, netchan_t *chan, netadr_t adr, int qport, void *client, int (*pfnBlockSize)(void *, fragsize_t mode ))
 {
 	Netchan_Clear( chan );
 
diff --git a/engine/common/netchan.h b/engine/common/netchan.h
index aa4b3420..79cf49d7 100644
--- a/engine/common/netchan.h
+++ b/engine/common/netchan.h
@@ -268,7 +268,7 @@ extern int		net_drop;
 
 void Netchan_Init( void );
 void Netchan_Shutdown( void );
-void Netchan_Setup( netsrc_t sock, netchan_t *chan, netadr_t adr, int qport, void *client, int (*pfnBlockSize)(void * ) );
+void Netchan_Setup( netsrc_t sock, netchan_t *chan, netadr_t adr, int qport, void *client, int (*pfnBlockSize)(void *, fragsize_t mode ) );
 void Netchan_CreateFileFragmentsFromBuffer( netchan_t *chan, const char *filename, byte *pbuf, int size );
 qboolean Netchan_CopyNormalFragments( netchan_t *chan, sizebuf_t *msg, size_t *length );
 qboolean Netchan_CopyFileFragments( netchan_t *chan, sizebuf_t *msg );