diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 2d34afb..d1ffca8 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -941,10 +941,10 @@
 		return;
 	}
 
-	if (base + size > MAX_PHYS_ADDR) {
-		pr_warning("Ignoring memory range 0x%lx - 0x%llx\n",
-				ULONG_MAX, base + size);
-		size = MAX_PHYS_ADDR - base;
+	if (base + size - 1 > MAX_PHYS_ADDR) {
+		pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
+				((u64)MAX_PHYS_ADDR) + 1, base + size);
+		size = MAX_PHYS_ADDR - base + 1;
 	}
 
 	if (base + size < phys_offset) {