diff --git a/image/image.py b/image/image.py
index 029954b..123ef6a 100644
--- a/image/image.py
+++ b/image/image.py
@@ -356,7 +356,7 @@ def create_img_file(image_path: str, size_str: str):
 
 def partition_device(device: str, sector_size: int, boot_partition_size_mb: int = IMG_DEFAULT_SIZE_BOOT_MB):
     initial_offset = 1048576 // sector_size  # 2048 for 512, 256 for 4096
-    boot_partition_size: int = align_bytes(boot_partition_size_mb * 1024 * 1024, 4096)
+    boot_partition_size: int = align_bytes((boot_partition_size_mb + 1) * 1024 * 1024, 4096)
     create_partition_table = ['mklabel', 'msdos']
     create_boot_partition = ['mkpart', 'primary', 'ext2', f'{initial_offset}s', f'{boot_partition_size}b']
     create_root_partition = ['mkpart', 'primary', f'{bytes_to_sectors(boot_partition_size, sector_size) + initial_offset}s', '100%']