diff --git a/lib/libpam/modules/pam_krb5/Makefile b/lib/libpam/modules/pam_krb5/Makefile
index 989e9aa59dfc..500801b84841 100644
--- a/lib/libpam/modules/pam_krb5/Makefile
+++ b/lib/libpam/modules/pam_krb5/Makefile
@@ -29,6 +29,7 @@ SRCS=	pam_krb5.c
 MAN=	pam_krb5.8
 .if defined(_FREEFALL_CONFIG)
 CFLAGS+=-D_FREEFALL_CONFIG
+WARNS=	3
 .endif
 
 DPADD=	${LIBKRB5} ${LIBHX509} ${LIBASN1} ${LIBROKEN} ${LIBCOM_ERR} ${LIBCRYPT} ${LIBCRYPTO}