diff --git a/jc/parsers/os_prober.py b/jc/parsers/os_prober.py
index 9e0a7051..06b71d29 100644
--- a/jc/parsers/os_prober.py
+++ b/jc/parsers/os_prober.py
@@ -67,7 +67,7 @@ def _process(proc_data: JSONDictType) -> JSONDictType:
     """
     # check for EFI partition@boot-manager and split/add fields
     if 'partition' in proc_data and '@' in proc_data['partition']:  # type: ignore
-        new_part, efi_bootmgr = proc_data['partition'].split('@')  # type: ignore
+        new_part, efi_bootmgr = proc_data['partition'].split('@', maxsplit=1)  # type: ignore
         proc_data['partition'] = new_part
         proc_data['efi_bootmgr'] = efi_bootmgr