diff --git a/engine/server/server.h b/engine/server/server.h
index 84ae4f14..a860882e 100644
--- a/engine/server/server.h
+++ b/engine/server/server.h
@@ -540,7 +540,7 @@ void SV_ExecuteClientMessage( sv_client_t *cl, sizebuf_t *msg );
 void SV_ConnectionlessPacket( netadr_t from, sizebuf_t *msg );
 edict_t *SV_FakeConnect( const char *netname );
 void SV_BuildReconnect( sizebuf_t *msg );
-int SV_CalcPing( sv_client_t *cl );
+int SV_CalcPing( const sv_client_t *cl );
 void SV_UpdateServerInfo( void );
 void SV_EndRedirect( host_redirect_t *rd );
 void SV_RejectConnection( netadr_t from, const char *fmt, ... ) FORMAT_CHECK( 2 );
diff --git a/engine/server/sv_client.c b/engine/server/sv_client.c
index 81d7775a..cd7f3114 100644
--- a/engine/server/sv_client.c
+++ b/engine/server/sv_client.c
@@ -1087,7 +1087,7 @@ SV_CalcPing
 recalc ping on current client
 ===================
 */
-int SV_CalcPing( sv_client_t *cl )
+int SV_CalcPing( const sv_client_t *cl )
 {
 	float		ping = 0;
 	int		i, count;