diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9c2dc5d..6fa9f17 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -963,7 +963,7 @@
 #ifdef CONFIG_X86_32
 	return address >= TASK_SIZE;
 #else
-	return address >= TASK_SIZE64;
+	return address >= TASK_SIZE_MAX;
 #endif
 }