diff --git a/package/zfs/zfs.mk b/package/zfs/zfs.mk
index dbda8aceb4..c04d2ff5cf 100644
--- a/package/zfs/zfs.mk
+++ b/package/zfs/zfs.mk
@@ -52,7 +52,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_LINUX_PAM),y)
 ZFS_DEPENDENCIES += linux-pam
-ZFS_CONF_ENV += --enable-pam=yes
+ZFS_CONF_OPTS += --enable-pam
 else
 ZFS_CONF_OPTS += --disable-pam
 endif