diff --git a/plugins/sudoers/auth/kerb5.c b/plugins/sudoers/auth/kerb5.c
index ca31f99aa..53e0f7846 100644
--- a/plugins/sudoers/auth/kerb5.c
+++ b/plugins/sudoers/auth/kerb5.c
@@ -197,7 +197,7 @@ sudo_krb5_verify(struct passwd *pw, char *pass, sudo_auth *auth, struct sudo_con
 }
 #else
 int
-sudo_krb5_verify(struct passwd *pw, char *pass, sudo_auth *auth)
+sudo_krb5_verify(struct passwd *pw, char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
 {
     krb5_context	sudo_context;
     krb5_principal	princ;