diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 98c551027ff..bef04e50302 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -6259,6 +6259,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                 write(`], function(${exportFunctionForFile}) {`);
                 writeLine();
                 increaseIndent();
+                emitEmitHelpers(node);
                 emitCaptureThisForNodeIfNecessary(node);
                 emitSystemModuleBody(node, startIndex);
                 decreaseIndent();
@@ -6330,6 +6331,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
             }
 
             function emitAMDModule(node: SourceFile, startIndex: number) {
+                emitEmitHelpers(node);
                 collectExternalModuleInfo(node);
 
                 writeLine();
@@ -6351,6 +6353,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
             }
 
             function emitCommonJSModule(node: SourceFile, startIndex: number) {
+                emitEmitHelpers(node);
                 collectExternalModuleInfo(node);
                 emitExportStarHelper();
                 emitCaptureThisForNodeIfNecessary(node);
@@ -6360,6 +6363,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
             }
 
             function emitUMDModule(node: SourceFile, startIndex: number) {
+                emitEmitHelpers(node);
                 collectExternalModuleInfo(node);
 
                 // Module is detected first to support Browserify users that load into a browser with an AMD loader
@@ -6389,6 +6393,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                 exportSpecifiers = undefined;
                 exportEquals = undefined;
                 hasExportStars = false;
+                emitEmitHelpers(node);
                 emitCaptureThisForNodeIfNecessary(node);
                 emitLinesStartingAt(node.statements, startIndex);
                 emitTempDeclarations(/*newLine*/ true);
@@ -6527,14 +6532,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                 }
             }
 
-            function emitSourceFileNode(node: SourceFile) {
-                // Start new file on new line
-                writeLine();
-                emitDetachedComments(node);
-
-                // emit prologue directives prior to __extends
-                let startIndex = emitDirectivePrologues(node.statements, /*startWithNewLine*/ false);
-
+            function emitEmitHelpers(node: SourceFile): void {
                 // Only emit helpers if the user did not say otherwise.
                 if (!compilerOptions.noEmitHelpers) {
                     // Only Emit __extends function when target ES5.
@@ -6562,6 +6560,15 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                         awaiterEmitted = true;
                     }
                 }
+            }
+
+            function emitSourceFileNode(node: SourceFile) {
+                // Start new file on new line
+                writeLine();
+                emitDetachedComments(node);
+
+                // emit prologue directives prior to __extends
+                let startIndex = emitDirectivePrologues(node.statements, /*startWithNewLine*/ false);
 
                 if (isExternalModule(node) || compilerOptions.isolatedModules) {
                     if (languageVersion >= ScriptTarget.ES6) {
@@ -6585,6 +6592,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     exportSpecifiers = undefined;
                     exportEquals = undefined;
                     hasExportStars = false;
+                    emitEmitHelpers(node);
                     emitCaptureThisForNodeIfNecessary(node);
                     emitLinesStartingAt(node.statements, startIndex);
                     emitTempDeclarations(/*newLine*/ true);
diff --git a/tests/baselines/reference/systemModuleWithSuperClass.js b/tests/baselines/reference/systemModuleWithSuperClass.js
index f0c41d34fca..3484606ee0e 100644
--- a/tests/baselines/reference/systemModuleWithSuperClass.js
+++ b/tests/baselines/reference/systemModuleWithSuperClass.js
@@ -28,12 +28,12 @@ System.register([], function(exports_1) {
     }
 });
 //// [bar.js]
-var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
-    function __() { this.constructor = d; }
-    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
-};
 System.register(['./foo'], function(exports_1) {
+    var __extends = (this && this.__extends) || function (d, b) {
+        for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
     var foo_1;
     var Bar;
     return {