diff --git a/src/utils/uefi.py b/src/utils/uefi.py
index 3817f8b..baa53f6 100644
--- a/src/utils/uefi.py
+++ b/src/utils/uefi.py
@@ -25,7 +25,7 @@ def _find_bootentry(entries, label):
         if entry['description'] == label:
             return entry
     else:
-        raise OgError('Boot entry {label} not found')
+        raise OgError(f'Boot entry {label} not found')
 
 
 def _strip_boot_prefix(entry):