diff --git a/src/ec/Makefile.inc b/src/ec/Makefile.inc
index 20d71ab786..37ee6dfbd6 100644
--- a/src/ec/Makefile.inc
+++ b/src/ec/Makefile.inc
@@ -1 +1 @@
-subdirs-y += acpi
+subdirs-$(CONFIG_EC_ACPI) += acpi