diff --git a/src/build/intro-core-runtime.js b/src/build/intro-core-runtime.js
index a070876eb..6ed79293c 100644
--- a/src/build/intro-core-runtime.js
+++ b/src/build/intro-core-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -30,3 +32,5 @@
 		root.Globalize = factory();
 	}
 }( this, function() {
+
+	"use strict";
diff --git a/src/build/intro-currency-runtime.js b/src/build/intro-currency-runtime.js
index 8f8442b3e..8140ef26c 100644
--- a/src/build/intro-currency-runtime.js
+++ b/src/build/intro-currency-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -37,6 +39,8 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var formatMessage = Globalize._formatMessage,
 	runtimeKey = Globalize._runtimeKey,
 	validateParameterPresence = Globalize._validateParameterPresence,
diff --git a/src/build/intro-date-runtime.js b/src/build/intro-date-runtime.js
index 7c4c45b7d..e971f7ada 100644
--- a/src/build/intro-date-runtime.js
+++ b/src/build/intro-date-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -37,6 +39,8 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var createErrorUnsupportedFeature = Globalize._createErrorUnsupportedFeature,
 	regexpEscape = Globalize._regexpEscape,
 	removeLiteralQuotes = Globalize._removeLiteralQuotes,
diff --git a/src/build/intro-message-runtime.js b/src/build/intro-message-runtime.js
index 522a9d697..92828e6a4 100644
--- a/src/build/intro-message-runtime.js
+++ b/src/build/intro-message-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -33,5 +35,7 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var runtimeKey = Globalize._runtimeKey,
 	validateParameterType = Globalize._validateParameterType;
diff --git a/src/build/intro-number-runtime.js b/src/build/intro-number-runtime.js
index cd37769eb..c1d9a262c 100644
--- a/src/build/intro-number-runtime.js
+++ b/src/build/intro-number-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -33,6 +35,8 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var createError = Globalize._createError,
 	regexpEscape = Globalize._regexpEscape,
 	runtimeKey = Globalize._runtimeKey,
diff --git a/src/build/intro-plural-runtime.js b/src/build/intro-plural-runtime.js
index f89418b9a..033ba46d7 100644
--- a/src/build/intro-plural-runtime.js
+++ b/src/build/intro-plural-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -33,6 +35,8 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var runtimeKey = Globalize._runtimeKey,
 	validateParameterPresence = Globalize._validateParameterPresence,
 	validateParameterType = Globalize._validateParameterType;
diff --git a/src/build/intro-relative-time-runtime.js b/src/build/intro-relative-time-runtime.js
index 0241f866c..f58f437cb 100644
--- a/src/build/intro-relative-time-runtime.js
+++ b/src/build/intro-relative-time-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -39,6 +41,8 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var formatMessage = Globalize._formatMessage,
 	runtimeKey = Globalize._runtimeKey,
 	validateParameterPresence = Globalize._validateParameterPresence,
diff --git a/src/build/intro-unit-runtime.js b/src/build/intro-unit-runtime.js
index 0241f866c..f58f437cb 100644
--- a/src/build/intro-unit-runtime.js
+++ b/src/build/intro-unit-runtime.js
@@ -15,6 +15,8 @@
  */
 (function( root, factory ) {
 
+	"use strict";
+
 	// UMD returnExports
 	if ( typeof define === "function" && define.amd ) {
 
@@ -39,6 +41,8 @@
 	}
 }(this, function( Globalize ) {
 
+	"use strict";
+
 var formatMessage = Globalize._formatMessage,
 	runtimeKey = Globalize._runtimeKey,
 	validateParameterPresence = Globalize._validateParameterPresence,