diff --git a/codemp/null/null_client.cpp b/codemp/null/null_client.cpp
index a0bafab5fa..fff73ff1c0 100644
--- a/codemp/null/null_client.cpp
+++ b/codemp/null/null_client.cpp
@@ -41,7 +41,7 @@ void Key_WriteBindings( fileHandle_t f ) {
 void CL_Frame ( int msec ) {
 }
 
-void CL_PacketEvent( netadr_t from, msg_t *msg ) {
+void CL_PacketEvent( const netadr_t *from, msg_t *msg ) {
 }
 
 void CL_CharEvent( int key ) {