diff --git a/haystack/components/converters/output_adapter.py b/haystack/components/converters/output_adapter.py
index 0e1682c6be..50ffd53919 100644
--- a/haystack/components/converters/output_adapter.py
+++ b/haystack/components/converters/output_adapter.py
@@ -4,11 +4,11 @@
 
 import ast
 import contextlib
-from typing import Any, Callable, Dict, Optional, Set, Union
+from typing import Any, Callable, Dict, Optional, Set
 from warnings import warn
 
 import jinja2.runtime
-from jinja2 import TemplateSyntaxError, meta
+from jinja2 import Environment, TemplateSyntaxError, meta
 from jinja2.nativetypes import NativeEnvironment
 from jinja2.sandbox import SandboxedEnvironment
 from typing_extensions import TypeAlias
@@ -77,9 +77,9 @@ def __init__(
                 "Use this only if you trust the source of the template."
             )
             warn(msg)
-            self._env = NativeEnvironment()
-        else:
-            self._env = SandboxedEnvironment(undefined=jinja2.runtime.StrictUndefined)
+        self._env = (
+            NativeEnvironment() if self._unsafe else SandboxedEnvironment(undefined=jinja2.runtime.StrictUndefined)
+        )
 
         try:
             self._env.parse(template)  # Validate template syntax
@@ -173,7 +173,7 @@ def from_dict(cls, data: Dict[str, Any]) -> "OutputAdapter":
             }
         return default_from_dict(cls, data)
 
-    def _extract_variables(self, env: Union[NativeEnvironment, SandboxedEnvironment]) -> Set[str]:
+    def _extract_variables(self, env: Environment) -> Set[str]:
         """
         Extracts all variables from a list of Jinja template strings.
 
diff --git a/haystack/components/routers/conditional_router.py b/haystack/components/routers/conditional_router.py
index 3cd0feb675..ccac555d3d 100644
--- a/haystack/components/routers/conditional_router.py
+++ b/haystack/components/routers/conditional_router.py
@@ -139,9 +139,8 @@ def __init__(self, routes: List[Dict], custom_filters: Optional[Dict[str, Callab
                 "Use this only if you trust the source of the template."
             )
             warn(msg)
-            self._env = NativeEnvironment()
-        else:
-            self._env = SandboxedEnvironment()
+
+        self._env = NativeEnvironment() if self._unsafe else SandboxedEnvironment()
         self._env.filters.update(self.custom_filters)
 
         self._validate_routes(routes)