diff --git a/arch/um/Kconfig.x86_64 b/arch/um/Kconfig.x86_64
index f60e9e5..d632e9a 100644
--- a/arch/um/Kconfig.x86_64
+++ b/arch/um/Kconfig.x86_64
@@ -17,24 +17,12 @@
 
 config TOP_ADDR
  	hex
-	default 0x80000000
+	default 0x7fc0000000
 
 config 3_LEVEL_PGTABLES
        bool
        default y
 
-config STUB_CODE
-	hex
-	default 0x7fbfffe000
-
-config STUB_DATA
-	hex
-	default 0x7fbffff000
-
-config STUB_START
-	hex
-	default STUB_CODE
-
 config ARCH_HAS_SC_SIGNALS
 	bool
 	default n