diff --git a/moler/device/proxy_pc.py b/moler/device/proxy_pc.py
index 41ec8f13c..fd241609a 100644
--- a/moler/device/proxy_pc.py
+++ b/moler/device/proxy_pc.py
@@ -155,8 +155,10 @@ def _prepare_state_prompts(self):
             else:
                 state_prompts = self._prepare_state_prompts_without_proxy_pc()
         except KeyError as ke:
-            raise DeviceFailure(device=self.__class__.__name__,
-                message=f"Wrong configuration. Cannot get prompts. {ke} {repr(ke)}")
+            raise DeviceFailure(
+                device=self.__class__.__name__,
+                message=f"Wrong configuration. Cannot get prompts. {ke} {repr(ke)}"
+            )
 
         self._update_dict(self._state_prompts, state_prompts)
 
diff --git a/moler/device/unixremote.py b/moler/device/unixremote.py
index f396ba537..fc3f90df4 100644
--- a/moler/device/unixremote.py
+++ b/moler/device/unixremote.py
@@ -451,8 +451,10 @@ def _overwrite_prompts(self):
                     self._configurations[UnixRemote.connection_hops][UnixRemote.unix_local][UnixRemote.unix_remote][
                         "command_params"]["expected_prompt"]
         except KeyError as ke:
-            raise DeviceFailure(device=self.__class__.__name__,
-                message=f"Wrong configuration. Cannot get prompts. {ke} {repr(ke)}")
+            raise DeviceFailure(
+                device=self.__class__.__name__,
+                message=f"Wrong configuration. Cannot get prompts. {ke} {repr(ke)}"
+            )
 
     def _get_packages_for_state(self, state, observer):
         """