diff --git a/lib/libpam/modules/pam_ssh/pam_ssh.c b/lib/libpam/modules/pam_ssh/pam_ssh.c
index 11ebfe8d72f9..095f90eae1b1 100644
--- a/lib/libpam/modules/pam_ssh/pam_ssh.c
+++ b/lib/libpam/modules/pam_ssh/pam_ssh.c
@@ -57,6 +57,7 @@ __FBSDID("$FreeBSD$");
 #include <openssl/evp.h>
 
 #include "key.h"
+#include "buffer.h"
 #include "authfd.h"
 #include "authfile.h"