diff --git a/arch/x86/lib/physmem.c b/arch/x86/lib/physmem.c
index 1eb97ac..382f768 100644
--- a/arch/x86/lib/physmem.c
+++ b/arch/x86/lib/physmem.c
@@ -14,6 +14,7 @@
 #include <asm/cpu.h>
 #include <asm/global_data.h>
 #include <linux/compiler.h>
+#include <linux/sizes.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -144,7 +145,7 @@
 
 	/* Make sure the window is below U-Boot. */
 	assert(window + LARGE_PAGE_SIZE <
-	       gd->relocaddr - CONFIG_SYS_MALLOC_LEN - CFG_SYS_STACK_SIZE);
+	       gd->relocaddr - CONFIG_SYS_MALLOC_LEN - SZ_32K);
 	/* Map the page into the window and then memset the appropriate part. */
 	x86_phys_map_page(window, map_addr, 1);
 	memset((void *)(window + offset), c, size);