diff --git a/include/proto/connection.h b/include/proto/connection.h
index 2380bb8..235671e 100644
--- a/include/proto/connection.h
+++ b/include/proto/connection.h
@@ -502,6 +502,10 @@
 	conn->target = NULL;
 	conn->proxy_netns = NULL;
 	LIST_INIT(&conn->list);
+
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
+	conn->async_fd = -1;
+#endif
 }
 
 /* Tries to allocate a new connection and initialized its main fields. The
diff --git a/include/types/connection.h b/include/types/connection.h
index 9d1b51a..e19f883 100644
--- a/include/types/connection.h
+++ b/include/types/connection.h
@@ -303,6 +303,10 @@
 		struct sockaddr_storage from;	/* client address, or address to spoof when connecting to the server */
 		struct sockaddr_storage to;	/* address reached by the client, or address to connect to */
 	} addr; /* addresses of the remote side, client for producer and server for consumer */
+
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
+	OSSL_ASYNC_FD async_fd;
+#endif
 };
 
 /* proxy protocol v2 definitions */