diff --git a/src/soc/cavium/cn81xx/Kconfig b/src/soc/cavium/cn81xx/Kconfig
index 368581f8f1..5593685a37 100644
--- a/src/soc/cavium/cn81xx/Kconfig
+++ b/src/soc/cavium/cn81xx/Kconfig
@@ -39,4 +39,7 @@ config STACK_SIZE
 config ECAM_MMCONF_BASE_ADDRESS
 	default 0x848000000000
 
+config ECAM_MMCONF_BUS_NUMBER
+	default 32
+
 endif