diff --git a/ssl/internal.h b/ssl/internal.h
index 881f930..fe37595 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -2628,7 +2628,6 @@
 };
 
 // From draft-ietf-tls-tls13-18, used in determining PSK modes.
-#define SSL_PSK_KE     0x0
 #define SSL_PSK_DHE_KE 0x1
 
 // From draft-ietf-tls-tls13-16, used in determining whether to respond with a