diff --git a/inventory_provider/routes/poller.py b/inventory_provider/routes/poller.py
index bf3d10d16dfe7656c0e737bd2061b4ab9a81ec53..8165867f493207cb3dac38f2ea6fc4e2ea5b5c68 100644
--- a/inventory_provider/routes/poller.py
+++ b/inventory_provider/routes/poller.py
@@ -897,7 +897,7 @@ def interface_speed(ifc):
                 logger.warning(f'unrecognised speed: {speed}, using _name_to_speed fallback')
                 return _name_to_speed(ifc['name'])
         else:
-            logger.warning(f'no speed data for interface, using _name_to_speed fallback')
+            logger.warning('no speed data for interface, using _name_to_speed fallback')
             return _name_to_speed(ifc['name'])
 
     if ifc['bundle-parents']: