diff --git a/src/dsdk/persistor.py b/src/dsdk/persistor.py
index a892d27..f4f385e 100644
--- a/src/dsdk/persistor.py
+++ b/src/dsdk/persistor.py
@@ -171,10 +171,8 @@ def dry_run(
         parameters: Dict[str, Any],
         exceptions: Tuple = (),
     ):
-        """Execute sql found in asse with dry_run parameter set to 1."""
+        """Execute sql found in asset with dry_run."""
         logger.info(self.ON)
-        parameters = parameters.copy()
-        parameters["dry_run"] = 1
         errors = []
         for path, query in self.sql():
             logger.info(self.DRY_RUN, path)
@@ -192,12 +190,12 @@ def dry_run_query(
         parameters,
         exceptions: Tuple = (),
     ) -> Optional[Exception]:
-        """Dry run query."""
+        """Dry run query with dry_run parameter set to 1."""
         with self.rollback() as cur:
             rendered = self.render_without_keys(
                 cur,
                 query,
-                parameters,
+                {**parameters, "dry_run": 1},
             )
             with NamedTemporaryFile("w", delete=False, suffix=".sql") as fout:
                 fout.write(rendered)