diff --git a/debian.rockchip/config/config.common.ubuntu b/debian.rockchip/config/config.common.ubuntu
index 5776705e16f6..e84410c88929 100644
--- a/debian.rockchip/config/config.common.ubuntu
+++ b/debian.rockchip/config/config.common.ubuntu
@@ -3857,7 +3857,7 @@ CONFIG_PPS=y
 # PPS clients support
 #
 CONFIG_PPS_CLIENT_KTIMER=m
-# CONFIG_PPS_CLIENT_LDISC is not set
+CONFIG_PPS_CLIENT_LDISC=m
 CONFIG_PPS_CLIENT_GPIO=m
 
 #