diff --git a/pmb/config/__init__.py b/pmb/config/__init__.py
index 91cf265f..4129783b 100644
--- a/pmb/config/__init__.py
+++ b/pmb/config/__init__.py
@@ -262,6 +262,7 @@ deviceinfo_attributes = [
     "flash_fastboot_max_size",
     "flash_fastboot_vendor_id",
     "flash_sparse",
+    "rootfs_image_sector_size",
 
     # weston
     "weston_pixman_type",
diff --git a/pmb/install/losetup.py b/pmb/install/losetup.py
index df3dbd27..15d78f0a 100644
--- a/pmb/install/losetup.py
+++ b/pmb/install/losetup.py
@@ -52,7 +52,13 @@ def mount(args, img_path):
 
         # Mount and return on success
         init(args)
-        pmb.chroot.root(args, ["losetup", "-f", img_path], check=False)
+
+        losetup_cmd = ["losetup", "-f", img_path]
+        sector_size = args.deviceinfo["rootfs_image_sector_size"]
+        if sector_size:
+            losetup_cmd += ["-b", str(int(sector_size))]
+
+        pmb.chroot.root(args, losetup_cmd, check=False)
         if device_by_back_file(args, img_path):
             return