diff --git a/vm_supervisor/conf.py b/vm_supervisor/conf.py
index e704b82a5..31d935630 100644
--- a/vm_supervisor/conf.py
+++ b/vm_supervisor/conf.py
@@ -75,7 +75,7 @@ def get_default_interface() -> Optional[str]:
     with open("/proc/net/route", "r") as f:
         for line in f.readlines():
             parts = line.strip().split()
-            if parts[1] == '00000000':  # Indicates default route
+            if parts[1] == "00000000":  # Indicates default route
                 return parts[0]
     return None