diff --git a/NOTES b/NOTES
index 3408e25..218dbe8 100644
--- a/NOTES
+++ b/NOTES
@@ -72,7 +72,6 @@ it uses select(), I'm not sure how I would honor Thread.interrupt() or
 whatever.  It's not guaranteed to interrupt select(), and I'm not keen on
 adding an arbitrary timeout/polling feature to it.
 
-XXX - use ptmx
 XXX - disable utmp/wtmp
 XXX - disable /etc/passwd (accept all usernames the same, and use the explicitly-provided shell and home directories)
 XXX - visit XXX in jni/interface.c
diff --git a/jni/config.h b/jni/config.h
index 8e12630..090c79e 100644
--- a/jni/config.h
+++ b/jni/config.h
@@ -18,6 +18,7 @@
 
 #define HAVE_BASENAME 1
 #define HAVE_NETINET_TCP_H 1
+#define USE_DEV_PTMX 1
 
 #define DISABLE_ZLIB 1
 #define DISABLE_SYSLOG 1