diff --git a/ironic_python_agent/disk_utils.py b/ironic_python_agent/disk_utils.py
index 0daa3dbe7..55fa44869 100644
--- a/ironic_python_agent/disk_utils.py
+++ b/ironic_python_agent/disk_utils.py
@@ -581,8 +581,8 @@ def destroy_disk_metadata(dev, node_uuid):
         raise errors.DeploymentError(
             f'Destroying metadata failed on device {dev}s. Error: {e}')
 
-    LOG.info(f"Disk metadata on {dev} successfully destroyed for node "
-             f"{node_uuid}")
+    LOG.info("Disk metadata on %s successfully destroyed for node "
+             "%s", dev, node_uuid)
 
 
 def _fix_gpt_structs(device, node_uuid):
diff --git a/ironic_python_agent/mdns.py b/ironic_python_agent/mdns.py
index 5a982f084..7a56c64cd 100644
--- a/ironic_python_agent/mdns.py
+++ b/ironic_python_agent/mdns.py
@@ -124,8 +124,8 @@ class Zeroconf(object):
                     f'None of addresses {all_addr} for service %('
                     '{service_type} are valid')
             else:
-                LOG.warning(f'None of addresses {all_addr} seem routable, '
-                            f'using {fallback}')
+                LOG.warning('None of addresses %s seem routable, '
+                            'using %s', all_addr, fallback)
                 address = fallback
 
         properties = {}
diff --git a/ironic_python_agent/utils.py b/ironic_python_agent/utils.py
index 31bcd5501..f208c73d2 100644
--- a/ironic_python_agent/utils.py
+++ b/ironic_python_agent/utils.py
@@ -267,7 +267,7 @@ def unlink_without_raise(path):
         if e.errno == errno.ENOENT:
             return
         else:
-            LOG.warning(f"Failed to unlink {path}, error: {e}")
+            LOG.warning("Failed to unlink %s, error: %s", path, e)
 
 
 def _read_params_from_file(filepath):