diff --git a/src/finalisers/system.ts b/src/finalisers/system.ts
index 1eb45f65d43..375143c0188 100644
--- a/src/finalisers/system.ts
+++ b/src/finalisers/system.ts
@@ -173,7 +173,7 @@ export default function system(
 	let wrapperStart =
 		`System.register(${registeredName}[` +
 		dependencyIds.join(`,${_}`) +
-		`],${_}function${_}(${wrapperParams})${_}{${n}${t}'use strict';` +
+		`],${_}function${_}(${wrapperParams})${_}{${n}${t}${options.strict ? "'use strict';" : ''}` +
 		getStarExcludesBlock(starExcludes, varOrConst, _, t, n) +
 		getImportBindingsBlock(importBindings, _, t, n) +
 		`${n}${t}return${_}{${
diff --git a/test/form/samples/strict-false/_config.js b/test/form/samples/strict-false/_config.js
new file mode 100644
index 00000000000..dac5b866925
--- /dev/null
+++ b/test/form/samples/strict-false/_config.js
@@ -0,0 +1,8 @@
+module.exports = {
+	description: 'use strict should not be present',
+	options: {
+		output: {
+			strict: false
+		}
+	}
+};
diff --git a/test/form/samples/strict-false/_expected/amd.js b/test/form/samples/strict-false/_expected/amd.js
new file mode 100644
index 00000000000..374a89b69eb
--- /dev/null
+++ b/test/form/samples/strict-false/_expected/amd.js
@@ -0,0 +1,13 @@
+define(function () {
+
+    const localVariable = 'local';
+
+    try {
+        globalVariable = localVariable;
+    } catch (error) {
+        console.log('use strict; detected', error);
+
+        Function("g", "globalVariable = g")(localVariable);
+    }
+
+});
diff --git a/test/form/samples/strict-false/_expected/cjs.js b/test/form/samples/strict-false/_expected/cjs.js
new file mode 100644
index 00000000000..bd207c44a45
--- /dev/null
+++ b/test/form/samples/strict-false/_expected/cjs.js
@@ -0,0 +1,9 @@
+const localVariable = 'local';
+
+try {
+    globalVariable = localVariable;
+} catch (error) {
+    console.log('use strict; detected', error);
+
+    Function("g", "globalVariable = g")(localVariable);
+}
diff --git a/test/form/samples/strict-false/_expected/es.js b/test/form/samples/strict-false/_expected/es.js
new file mode 100644
index 00000000000..bd207c44a45
--- /dev/null
+++ b/test/form/samples/strict-false/_expected/es.js
@@ -0,0 +1,9 @@
+const localVariable = 'local';
+
+try {
+    globalVariable = localVariable;
+} catch (error) {
+    console.log('use strict; detected', error);
+
+    Function("g", "globalVariable = g")(localVariable);
+}
diff --git a/test/form/samples/strict-false/_expected/iife.js b/test/form/samples/strict-false/_expected/iife.js
new file mode 100644
index 00000000000..5e3ed9081ea
--- /dev/null
+++ b/test/form/samples/strict-false/_expected/iife.js
@@ -0,0 +1,12 @@
+(function () {
+    const localVariable = 'local';
+
+    try {
+        globalVariable = localVariable;
+    } catch (error) {
+        console.log('use strict; detected', error);
+
+        Function("g", "globalVariable = g")(localVariable);
+    }
+
+}());
diff --git a/test/form/samples/strict-false/_expected/system.js b/test/form/samples/strict-false/_expected/system.js
new file mode 100644
index 00000000000..2ed282add3d
--- /dev/null
+++ b/test/form/samples/strict-false/_expected/system.js
@@ -0,0 +1,18 @@
+System.register([], function () {
+    
+    return {
+        execute: function () {
+
+            const localVariable = 'local';
+
+            try {
+                globalVariable = localVariable;
+            } catch (error) {
+                console.log('use strict; detected', error);
+
+                Function("g", "globalVariable = g")(localVariable);
+            }
+
+        }
+    };
+});
diff --git a/test/form/samples/strict-false/_expected/umd.js b/test/form/samples/strict-false/_expected/umd.js
new file mode 100644
index 00000000000..6db1e8e95a6
--- /dev/null
+++ b/test/form/samples/strict-false/_expected/umd.js
@@ -0,0 +1,15 @@
+(function (factory) {
+    typeof define === 'function' && define.amd ? define(factory) :
+    factory();
+}(function () {
+    const localVariable = 'local';
+
+    try {
+        globalVariable = localVariable;
+    } catch (error) {
+        console.log('use strict; detected', error);
+
+        Function("g", "globalVariable = g")(localVariable);
+    }
+
+}));
diff --git a/test/form/samples/strict-false/main.js b/test/form/samples/strict-false/main.js
new file mode 100644
index 00000000000..ee565e65983
--- /dev/null
+++ b/test/form/samples/strict-false/main.js
@@ -0,0 +1,9 @@
+const localVariable = 'local'
+
+try {
+    globalVariable = localVariable;
+} catch (error) {
+    console.log('use strict; detected', error);
+
+    Function("g", "globalVariable = g")(localVariable);
+}
\ No newline at end of file