diff --git a/ros2launch_security/node_action/security.py b/ros2launch_security/node_action/security.py
index fca08df..017f4c0 100644
--- a/ros2launch_security/node_action/security.py
+++ b/ros2launch_security/node_action/security.py
@@ -21,6 +21,7 @@
 from launch.launch_context import LaunchContext
 from launch.substitutions import LocalSubstitution
 from launch.utilities import normalize_to_list_of_substitutions
+from launch.utilities import perform_substitutions
 from launch_ros.actions.node import Node, NodeActionExtension
 
 import nodl
@@ -50,8 +51,14 @@ def _setup_security(
     ) -> None:
         """Enable encryption, creating a key for the node if necessary."""
         nodl_node = nodl.get_node_by_executable(
-            package_name=node_action.node_package,
-            executable_name=node_action.node_executable
+            package_name=perform_substitutions(
+                context,
+                normalize_to_list_of_substitutions(node_action.node_package)
+            ),
+            executable_name=perform_substitutions(
+                context,
+                normalize_to_list_of_substitutions(node_action.node_executable)
+            )
         )
 
         self.__enclave = node_action.node_name.replace(