diff --git a/include/openssl/ssl3.h b/include/openssl/ssl3.h
index 2a201aa..3d62763 100644
--- a/include/openssl/ssl3.h
+++ b/include/openssl/ssl3.h
@@ -485,6 +485,15 @@
 		 * this extension to the client. */
 		uint16_t *peer_ellipticcurvelist;
 		size_t peer_ellipticcurvelist_length;
+
+		/* extended_master_secret indicates whether the extended master
+		 * secret computation is used in this handshake. Note that this
+		 * is different from whether it was used for the current
+		 * session. If this is a resumption handshake then EMS might be
+		 * negotiated in the client and server hello messages, but it
+		 * doesn't matter if the session that's being resumed didn't
+		 * use it to create the master secret initially. */
+		char extended_master_secret;
 		} tmp;
 
         /* Connection binding to prevent renegotiation attacks */