diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 9ecfa2a..460f0d2 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1311,7 +1311,8 @@
 			continue;
 		}
 
-		if (addr == carveout->start && (addr + size) == carveout->end) {
+		if (addr == carveout->start && (addr + size - 1) ==
+						carveout->end) {
 			if (phandlep)
 				*phandlep = fdt_get_phandle(blob, node);
 			return 0;