diff --git a/ssl/Makefile.am b/ssl/Makefile.am
index 2651181..b4d549d 100644
--- a/ssl/Makefile.am
+++ b/ssl/Makefile.am
@@ -56,6 +56,7 @@ libssl_la_SOURCES += tls13_lib.c
 libssl_la_SOURCES += tls13_record.c
 libssl_la_SOURCES += tls13_record_layer.c
 libssl_la_SOURCES += tls13_server.c
+libssl_la_SOURCES += tls13_error.c
 
 noinst_HEADERS = bytestring.h
 noinst_HEADERS += srtp.h