diff --git a/channels/misdn/isdn_lib.h b/channels/misdn/isdn_lib.h
index a127c8f4ea..34309a5844 100644
--- a/channels/misdn/isdn_lib.h
+++ b/channels/misdn/isdn_lib.h
@@ -350,7 +350,7 @@ void manager_bchannel_deactivate(struct misdn_bchannel * bc);
 
 int misdn_lib_tx2misdn_frm(struct misdn_bchannel *bc, void *data, int len);
 
-void manager_ph_control(struct misdn_bchannel *bc, long c1, long c2);
+void manager_ph_control(struct misdn_bchannel *bc, int c1, int c2);
 
 
 int misdn_lib_port_restart(int port);