diff --git a/overlay-atlas/profiles/base/make.defaults b/overlay-atlas/profiles/base/make.defaults
index d15050f..96e95e2 100644
--- a/overlay-atlas/profiles/base/make.defaults
+++ b/overlay-atlas/profiles/base/make.defaults
@@ -27,6 +27,7 @@
 
 # All firmware to build from the EC code base.
 EC_FIRMWARE="atlas"
+EC_FIRMWARE_EXTRA="atlas_ish"
 
 # iwlwifi firmware for ThunderPeak2/1216 chip.
 LINUX_FIRMWARE="${LINUX_FIRMWARE} iwlwifi-9260"