diff --git a/include/types/server.h b/include/types/server.h
index 4a31934..76225f7 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -167,6 +167,7 @@
 #define SRV_SSL_O_NONE         0x0000
 #define SRV_SSL_O_NO_TLS_TICKETS 0x0100 /* disable session resumption tickets */
 #define SRV_SSL_O_NO_REUSE     0x200  /* disable session reuse */
+#define SRV_SSL_O_EARLY_DATA   0x400  /* Allow using early data */
 #endif
 
 struct pid_list {