diff --git a/src/finalisers/iife.js b/src/finalisers/iife.js
index c497c2c..95c6d65 100644
--- a/src/finalisers/iife.js
+++ b/src/finalisers/iife.js
@@ -36,7 +36,7 @@ export default function iife ( bundle, magicString, { exportMode, indentString }
 	}
 
 	const useStrict = options.useStrict !== false ? `'use strict';` : ``;
-	if ( useStrict ) magicString.prepend( useStrict + '\n\n' );
+
 	let intro = `(function (${args}) {\n`;
 	let outro = `\n\n}(${dependencies}));`;
 
@@ -51,7 +51,7 @@ export default function iife ( bundle, magicString, { exportMode, indentString }
 	// var foo__default = 'default' in foo ? foo['default'] : foo;
 	const interopBlock = getInteropBlock( bundle );
 	if ( interopBlock ) magicString.prepend( interopBlock + '\n\n' );
-
+	if ( useStrict ) magicString.prepend( useStrict + '\n\n' );
 	const exportBlock = getExportBlock( bundle.entryModule, exportMode );
 	if ( exportBlock ) magicString.append( '\n\n' + exportBlock );
 
diff --git a/test/form/indent-false/_expected/iife.js b/test/form/indent-false/_expected/iife.js
index c6a9331..54ba717 100644
--- a/test/form/indent-false/_expected/iife.js
+++ b/test/form/indent-false/_expected/iife.js
@@ -1,5 +1,5 @@
 var foo = (function () {
-	'use strict';
+'use strict';
 
 function foo () {
 	console.log( 'indented with tabs' );
diff --git a/test/form/indent-true-spaces/_expected/iife.js b/test/form/indent-true-spaces/_expected/iife.js
index d4abc78..e22164f 100644
--- a/test/form/indent-true-spaces/_expected/iife.js
+++ b/test/form/indent-true-spaces/_expected/iife.js
@@ -1,5 +1,5 @@
 var foo = (function () {
-	'use strict';
+  'use strict';
 
   function foo () {
     console.log( 'indented with spaces' );
diff --git a/test/form/sourcemaps-inline/_expected/iife.js b/test/form/sourcemaps-inline/_expected/iife.js
index c02953f..dc4202f 100644
--- a/test/form/sourcemaps-inline/_expected/iife.js
+++ b/test/form/sourcemaps-inline/_expected/iife.js
@@ -1,4 +1,5 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	function foo () {
 		console.log( 'hello from foo.js' );
@@ -13,5 +14,5 @@
 	foo();
 	bar();
 
-})();
+}());
 //# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/test/form/sourcemaps/_expected/iife.js b/test/form/sourcemaps/_expected/iife.js
index 683379d..b45e3e8 100644
--- a/test/form/sourcemaps/_expected/iife.js
+++ b/test/form/sourcemaps/_expected/iife.js
@@ -1,4 +1,5 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	function foo () {
 		console.log( 'hello from foo.js' );
@@ -13,5 +14,5 @@
 	foo();
 	bar();
 
-})();
+}());
 //# sourceMappingURL=iife.js.map
\ No newline at end of file
diff --git a/test/form/spacing-after-function-with-semicolon/_expected/iife.js b/test/form/spacing-after-function-with-semicolon/_expected/iife.js
index ea1be49..7ff78ec 100644
--- a/test/form/spacing-after-function-with-semicolon/_expected/iife.js
+++ b/test/form/spacing-after-function-with-semicolon/_expected/iife.js
@@ -1,7 +1,8 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	function x () { return 'x' };
 
 	assert.equal( x(), 'x' );
 
-})();
+}());
diff --git a/test/form/string-indentation-b/_expected/iife.js b/test/form/string-indentation-b/_expected/iife.js
index 0ffdcbe..ae8c969 100644
--- a/test/form/string-indentation-b/_expected/iife.js
+++ b/test/form/string-indentation-b/_expected/iife.js
@@ -1,8 +1,9 @@
-(function () { 'use strict';
+(function () {
+    'use strict';
 
     var a = 'a';
     var b = 'b';
     assert.equal( a, 'a' );
     assert.equal( b, 'b' );
 
-})();
\ No newline at end of file
+}());
\ No newline at end of file
diff --git a/test/form/string-indentation/_expected/iife.js b/test/form/string-indentation/_expected/iife.js
index 47c6737..c2426fa 100644
--- a/test/form/string-indentation/_expected/iife.js
+++ b/test/form/string-indentation/_expected/iife.js
@@ -1,4 +1,5 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	var a = '1\
   2';
@@ -17,4 +18,4 @@
 	assert.equal( c, '1\n  2' );
 	assert.equal( d, '1\n\t2' );
 
-})();
+}());
diff --git a/test/form/unmodified-default-exports-function-argument/_expected/iife.js b/test/form/unmodified-default-exports-function-argument/_expected/iife.js
index 9fb882d..c21e450 100644
--- a/test/form/unmodified-default-exports-function-argument/_expected/iife.js
+++ b/test/form/unmodified-default-exports-function-argument/_expected/iife.js
@@ -1,4 +1,5 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	var foo = function () {
 		return 42;
@@ -13,4 +14,4 @@
 
 	console.log( answer );
 
-})();
+}());
diff --git a/test/form/unmodified-default-exports/_expected/iife.js b/test/form/unmodified-default-exports/_expected/iife.js
index 2942fdd..c07ff1a 100644
--- a/test/form/unmodified-default-exports/_expected/iife.js
+++ b/test/form/unmodified-default-exports/_expected/iife.js
@@ -1,4 +1,5 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	var Foo = function () {
 		this.isFoo = true;
@@ -12,4 +13,4 @@
 
 	var foo = new Foo();
 
-})();
+}());
diff --git a/test/form/unused-default-exports/_expected/iife.js b/test/form/unused-default-exports/_expected/iife.js
index a745745..2c6a515 100644
--- a/test/form/unused-default-exports/_expected/iife.js
+++ b/test/form/unused-default-exports/_expected/iife.js
@@ -1,4 +1,5 @@
-(function () { 'use strict';
+(function () {
+	'use strict';
 
 	var foo = { value: 1 };
 
@@ -11,4 +12,4 @@
 
 	assert.equal( foo.value, 2 );
 
-})();
+}());