diff --git a/meta-zaius/recipes-phosphor/chassis/refclock-fixup/fix_zaius_refclock.sh b/meta-zaius/recipes-phosphor/chassis/refclock-fixup/fix_zaius_refclock.sh
new file mode 100755
index 0000000..01eb72b
--- /dev/null
+++ b/meta-zaius/recipes-phosphor/chassis/refclock-fixup/fix_zaius_refclock.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+# fix up refclock by reconfiguring output of Si5338C clock generator
+
+i2cset="i2cset"
+clkgen_i2c_bus="0"
+clkgen_i2c_addr="0x70"
+
+# Usage: clkgen_write <address> <data> [write length]
+clkgen_write()
+{
+    $i2cset -y $clkgen_i2c_bus $clkgen_i2c_addr $1 $2 $3
+}
+
+# disable outputs
+clkgen_write 230 0x10 b
+
+# set output configurations of each of the four channels to 3.3V HCSL
+clkgen_write 36 0x07 b
+clkgen_write 37 0x07 b
+clkgen_write 38 0x07 b
+clkgen_write 39 0x07 b
+clkgen_write 40 0xe7 b
+clkgen_write 41 0x9c b
+clkgen_write 42 0x27 b
+
+# enable outputs
+clkgen_write 230 0x00 b
diff --git a/meta-zaius/recipes-phosphor/chassis/refclock-fixup/op-refclock-fixup@.service b/meta-zaius/recipes-phosphor/chassis/refclock-fixup/op-refclock-fixup@.service
new file mode 100644
index 0000000..f5d9f9e
--- /dev/null
+++ b/meta-zaius/recipes-phosphor/chassis/refclock-fixup/op-refclock-fixup@.service
@@ -0,0 +1,16 @@
+[Unit]
+Description=Fix up Zaius host refclock
+Wants=obmc-host-start-pre@%i.target
+Before=obmc-host-start-pre@%i.target
+Wants=obmc-power-on@%i.target
+After=obmc-power-on@%i.target
+Conflicts=obmc-chassis-stop@%i.target
+
+[Service]
+Restart=no
+Type=oneshot
+RemainAfterExit=yes
+ExecStart={sbindir}/fix_zaius_refclock.sh
+
+[Install]
+WantedBy=obmc-chassis-start@%i.target