diff --git a/gitlib/GitLib/disk.py b/gitlib/GitLib/disk.py
index 58ba2c3..09b3881 100644
--- a/gitlib/GitLib/disk.py
+++ b/gitlib/GitLib/disk.py
@@ -82,7 +82,13 @@ class DiskLibrary:
 
         (disk, partno) = self.split_device_partition(device)
 
-        result = subprocess.run(["/usr/sbin/sfdisk", "--part-uuid", disk, str(partno)], check=True, capture_output=True, encoding='utf-8')
+        result = subprocess.run(["/usr/sbin/sfdisk", "--part-uuid", disk, str(partno)], check=False, capture_output=True, encoding='utf-8')
+        if result.returncode != 0:
+            # We're using a DOS partition table, no UUID.
+            if "failed to get partition UUID" in result.stderr:
+                return ""
+            raise subprocess.CalledProcessError(result.returncode, result.args)
+
         return result.stdout.strip()
 
     def set_partition_uuid(self, device, uuid):