diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index b5e52e6..95c87da 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -144,6 +144,13 @@
 	help
 	  Increase this value if preram cbmem console is getting truncated
 
+config CBFS_MCACHE_SIZE
+	hex
+	depends on !NO_CBFS_MCACHE
+	default 0x2000
+	help
+	  Increase this value if you see CBFS mcache overflow warnings.
+
 config PC80_SYSTEM
 	bool
 	default y if ARCH_X86