diff --git a/include/os.h b/include/os.h
index 65b961e8c..51be06277 100644
--- a/include/os.h
+++ b/include/os.h
@@ -125,8 +125,6 @@ extern _X_EXPORT const char *ClientAuthorized(ClientPtr /*client */ ,
                                               unsigned int /*string_n */ ,
                                               char * /*auth_string */ );
 
-extern _X_EXPORT void CloseDownConnection(ClientPtr /*client */ );
-
 typedef void (*NotifyFdProcPtr)(int fd, int ready, void *data);
 
 #define X_NOTIFY_NONE   0x0
diff --git a/os/osdep.h b/os/osdep.h
index fdcb083b9..50d72b218 100644
--- a/os/osdep.h
+++ b/os/osdep.h
@@ -201,6 +201,7 @@ void ListenToAllClients(void);
 void ForceClockId(clockid_t forced_clockid);
 
 Bool WaitForSomething(Bool clients_are_ready);
+void CloseDownConnection(ClientPtr client);
 
 extern int LimitClients;
 extern Bool PartialNetwork;