diff --git a/src/cw/dtls_openssl.h b/src/cw/dtls_openssl.h
index 9445d687..1fb5cfec 100644
--- a/src/cw/dtls_openssl.h
+++ b/src/cw/dtls_openssl.h
@@ -48,5 +48,6 @@ extern int dtls_openssl_log_error_queue(const char *txt);
 
 extern BIO_METHOD * dtls_openssl_bio_method();
 
+extern int dtls_openssl_shutdown(struct conn *conn);
 
 #endif