diff --git a/meta-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup.bb b/meta-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup.bb
new file mode 100644
index 0000000..ac2c585
--- /dev/null
+++ b/meta-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup.bb
@@ -0,0 +1,21 @@
+DESCRIPTION = "Zaius host reference clock fixup"
+PR = "r0"
+
+inherit obmc-phosphor-systemd
+inherit obmc-phosphor-license
+
+TMPL = "op-refclock-fixup@.service"
+INSTFMT = "op-refclock-fixup@{0}.service"
+TGTFMT = "obmc-chassis-start@{0}.target"
+FMT = "../${TMPL}:${TGTFMT}.wants/${INSTFMT}"
+
+SYSTEMD_SERVICE_${PN} += "${TMPL}"
+SYSTEMD_LINK_${PN} += "${@compose_list(d, 'FMT', 'OBMC_CHASSIS_INSTANCES')}"
+
+SRC_URI += "file://fix_zaius_refclock.sh"
+RDEPENDS_${PN} += "i2c-tools"
+
+do_install() {
+        install -d ${D}${sbindir}
+        install -m 0755 ${WORKDIR}/fix_zaius_refclock.sh ${D}${sbindir}/fix_zaius_refclock.sh
+}
diff --git a/meta-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup/fix_zaius_refclock.sh b/meta-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup/fix_zaius_refclock.sh
new file mode 100755
index 0000000..01eb72b
--- /dev/null
+++ b/meta-ingrasys/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-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup/op-refclock-fixup@.service b/meta-ingrasys/meta-zaius/recipes-phosphor/chassis/refclock-fixup/op-refclock-fixup@.service
new file mode 100644
index 0000000..f5d9f9e
--- /dev/null
+++ b/meta-ingrasys/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
diff --git a/meta-ingrasys/meta-zaius/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-ingrasys/meta-zaius/recipes-phosphor/images/obmc-phosphor-image.bbappend
new file mode 100644
index 0000000..a7bb4d1
--- /dev/null
+++ b/meta-ingrasys/meta-zaius/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -0,0 +1,2 @@
+# TODO: make refclock-fixup append a dependency to P9 boot recipe when it exists
+OBMC_IMAGE_EXTRA_INSTALL_append = " refclock-fixup"