diff --git a/disk/part_efi.c b/disk/part_efi.c
index fe308d7..0af1e92 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -439,7 +439,7 @@
 			gpt_e[i].starting_lba = cpu_to_le64(offset);
 			offset += partitions[i].size;
 		}
-		if (offset >= last_usable_lba) {
+		if (offset > (last_usable_lba + 1)) {
 			printf("Partitions layout exceds disk size\n");
 			return -1;
 		}