diff --git a/ssh-keygen.c b/ssh-keygen.c
index adacbff..69b16e6 100644
--- a/ssh-keygen.c
+++ b/ssh-keygen.c
@@ -21,6 +21,7 @@
 
 #include <openssl/evp.h>
 #include <openssl/pem.h>
+#include "openbsd-compat/openssl-compat.h"
 
 #include <errno.h>
 #include <fcntl.h>