diff --git a/src/anemoi/inference/checkpoint/__init__.py b/src/anemoi/inference/checkpoint/__init__.py
index f1e54cf..c314885 100644
--- a/src/anemoi/inference/checkpoint/__init__.py
+++ b/src/anemoi/inference/checkpoint/__init__.py
@@ -206,5 +206,5 @@ def validate_environment(
                 raise ValueError(f"Invalid value for `on_difference`: {on_difference}")
             return False
 
-        LOG.info(f"Environment validation passed")
+        LOG.info("Environment validation passed")
         return True
diff --git a/src/anemoi/inference/checkpoint/metadata/__init__.py b/src/anemoi/inference/checkpoint/metadata/__init__.py
index da4949c..33bd5bc 100644
--- a/src/anemoi/inference/checkpoint/metadata/__init__.py
+++ b/src/anemoi/inference/checkpoint/metadata/__init__.py
@@ -345,7 +345,6 @@ def rounded_area(self, area):
         return area
 
     def report_loading_error(self):
-        import json
 
         if "provenance_training" not in self._metadata:
             return