diff --git a/ssh-keygen.c b/ssh-keygen.c
index 1a0d816ea..570f31795 100644
--- a/ssh-keygen.c
+++ b/ssh-keygen.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh-keygen.c,v 1.348 2019/09/06 05:23:55 djm Exp $ */
+/* $OpenBSD: ssh-keygen.c,v 1.349 2019/09/06 07:53:40 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -3108,7 +3108,10 @@ main(int argc, char **argv)
 		do_convert_to(pw);
 	if (convert_from)
 		do_convert_from(pw);
-#endif
+#else /* WITH_OPENSSL */
+	if (convert_to || convert_from)
+		fatal("key conversion disabled at compile time");
+#endif /* WITH_OPENSSL */
 	if (print_public)
 		do_print_public(pw);
 	if (rr_hostname != NULL) {