4 files changed, 8 insertions, 0 deletions
diff --git a/src/scenario/output/Html.js b/src/scenario/output/Html.js
index c1b15239..2098f214 100644
--- a/src/scenario/output/Html.js
+++ b/src/scenario/output/Html.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * User Interface for the Scenario Runner.
  *
diff --git a/src/scenario/output/Json.js b/src/scenario/output/Json.js
index 1e3bef6b..c024d923 100644
--- a/src/scenario/output/Json.js
+++ b/src/scenario/output/Json.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * Generates JSON output into a context.
  */
diff --git a/src/scenario/output/Object.js b/src/scenario/output/Object.js
index 1f29af9c..621b816f 100644
--- a/src/scenario/output/Object.js
+++ b/src/scenario/output/Object.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * Creates a global value $result with the result of the runner.
  */
diff --git a/src/scenario/output/Xml.js b/src/scenario/output/Xml.js
index 1a4c362c..9a2071b9 100644
--- a/src/scenario/output/Xml.js
+++ b/src/scenario/output/Xml.js
@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * Generates XML output into a context.
  */