diff --git a/ncat/ncat_ssl.c b/ncat/ncat_ssl.c
index ee8ca97..9ff495c 100644
--- a/ncat/ncat_ssl.c
+++ b/ncat/ncat_ssl.c
@@ -128,7 +128,9 @@
 
 #include <stdio.h>
 #include <openssl/ssl.h>
+#include <openssl/bn.h>
 #include <openssl/err.h>
+#include <openssl/rsa.h>
 #include <openssl/rand.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>