diff --git a/src/mainboard/google/sarien/Makefile.inc b/src/mainboard/google/sarien/Makefile.inc
index 6fd23cefcd..7c37bc9901 100644
--- a/src/mainboard/google/sarien/Makefile.inc
+++ b/src/mainboard/google/sarien/Makefile.inc
@@ -29,5 +29,10 @@ verstage-$(CONFIG_CHROMEOS) += chromeos.c
 
 ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_HDA_VERB) += hda_verb.c
 
+bootblock-$(CONFIG_EC_GOOGLE_WILCO) += ec.c
+ramstage-$(CONFIG_EC_GOOGLE_WILCO) += ec.c
+romstage-$(CONFIG_EC_GOOGLE_WILCO) += ec.c
+verstage-$(CONFIG_EC_GOOGLE_WILCO) += ec.c
+
 subdirs-y += variants/$(VARIANT_DIR)
 CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/include
diff --git a/src/mainboard/google/sarien/ec.c b/src/mainboard/google/sarien/ec.c
new file mode 100644
index 0000000000..fd8e84fbc8
--- /dev/null
+++ b/src/mainboard/google/sarien/ec.c
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <ec/google/wilco/commands.h>
+#include <variant/ec.h>
+
+void mainboard_post(uint8_t value)
+{
+	wilco_ec_save_post_code(value);
+}
diff --git a/src/mainboard/google/sarien/ramstage.c b/src/mainboard/google/sarien/ramstage.c
index e246419373..1d220461cf 100644
--- a/src/mainboard/google/sarien/ramstage.c
+++ b/src/mainboard/google/sarien/ramstage.c
@@ -15,7 +15,6 @@
 
 #include <arch/acpi.h>
 #include <drivers/vpd/vpd.h>
-#include <ec/google/wilco/commands.h>
 #include <smbios.h>
 #include <soc/gpio.h>
 #include <soc/ramstage.h>
@@ -70,11 +69,6 @@ void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 	cnl_configure_pads(gpio_table, num_gpios);
 }
 
-void mainboard_post(uint8_t value)
-{
-	wilco_ec_save_post_code(value);
-}
-
 static void mainboard_enable(struct device *dev)
 {
 	dev->ops->acpi_inject_dsdt_generator = chromeos_dsdt_generator;