diff --git a/ssh-agent.c b/ssh-agent.c
index f179483..6f8727b 100644
--- a/ssh-agent.c
+++ b/ssh-agent.c
@@ -51,6 +51,7 @@
 
 #include <openssl/evp.h>
 #include <openssl/md5.h>
+#include "openbsd-compat/openssl-compat.h"
 
 #include <errno.h>
 #include <fcntl.h>