diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 84b1fc1..6a3bbd8 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -127,6 +127,7 @@
 
 config SMM_MODULE_STACK_SIZE
 	hex
+	default 0x800 if ARCH_RAMSTAGE_X86_64
 	default 0x400
 	help
 	  This option determines the size of the stack within the SMM handler