diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 2d34afb2647d6b4bc8b8296577c9aee4efb6bb0e..d1ffca8b34eac51853c812a230cfd438862f8cff 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -941,10 +941,10 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
 		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) {