diff --git a/include/os.h b/include/os.h
index 4b4a896ab..f5beb6a94 100644
--- a/include/os.h
+++ b/include/os.h
@@ -320,9 +320,6 @@ OsAbort(void)
 extern _X_EXPORT Bool
 PrivsElevated(void);
 
-extern _X_EXPORT int
-ChangeAccessControl(ClientPtr /*client */ , int /*fEnabled */ );
-
 extern _X_EXPORT int
 GetClientFd(ClientPtr);
 
diff --git a/os/auth.h b/os/auth.h
index a4f096887..a05198f05 100644
--- a/os/auth.h
+++ b/os/auth.h
@@ -107,4 +107,6 @@ void DefineSelf(int fd);
 /* check whether given addr belongs to ourself */
 void AugmentSelf(void *from, int len);
 
+int ChangeAccessControl(ClientPtr client, int fEnabled);
+
 #endif /* _XSERVER_OS_AUTH_H */