diff --git a/lib/JsonpMainTemplatePlugin.js b/lib/JsonpMainTemplatePlugin.js
index 0e0b451e01f..5bcd5c572fb 100644
--- a/lib/JsonpMainTemplatePlugin.js
+++ b/lib/JsonpMainTemplatePlugin.js
@@ -19,9 +19,7 @@ class JsonpMainTemplatePlugin {
 					this.indent(
 						chunk.ids.map(id => `${JSON.stringify(id)}: 0`).join(",\n")
 					),
-					"};",
-					"",
-					"var resolvedPromise = new Promise(function(resolve) { resolve(); });"
+					"};"
 				]);
 			}
 			return source;
@@ -81,26 +79,27 @@ class JsonpMainTemplatePlugin {
 		});
 		mainTemplate.plugin("require-ensure", function(_, chunk, hash) {
 			return this.asString([
-				"if(installedChunks[chunkId] === 0) {",
+				"var installedChunkData = installedChunks[chunkId];",
+				"if(installedChunkData === 0) {",
 				this.indent([
-					"return resolvedPromise;"
+					"return new Promise(function(resolve) { resolve(); });"
 				]),
 				"}",
 				"",
 				"// a Promise means \"currently loading\".",
-				"if(installedChunks[chunkId]) {",
+				"if(installedChunkData) {",
 				this.indent([
-					"return installedChunks[chunkId][2];"
+					"return installedChunkData[2];"
 				]),
 				"}",
 				"",
 				"// setup Promise in chunk cache",
 				"var promise = new Promise(function(resolve, reject) {",
 				this.indent([
-					"installedChunks[chunkId] = [resolve, reject];"
+					"installedChunkData = installedChunks[chunkId] = [resolve, reject];"
 				]),
 				"});",
-				"installedChunks[chunkId][2] = promise;",
+				"installedChunkData[2] = promise;",
 				"",
 				"// start chunk loading",
 				"var head = document.getElementsByTagName('head')[0];",
diff --git a/lib/webworker/WebWorkerMainTemplatePlugin.js b/lib/webworker/WebWorkerMainTemplatePlugin.js
index 51a1698a132..a794745d4c6 100644
--- a/lib/webworker/WebWorkerMainTemplatePlugin.js
+++ b/lib/webworker/WebWorkerMainTemplatePlugin.js
@@ -21,9 +21,7 @@ class WebWorkerMainTemplatePlugin {
 							return id + ": 1";
 						}).join(",\n")
 					),
-					"};",
-					"",
-					"var resolvedPromise = new Promise(function(resolve) { resolve(); });"
+					"};"
 				]);
 			}
 			return source;
@@ -31,22 +29,26 @@ class WebWorkerMainTemplatePlugin {
 		mainTemplate.plugin("require-ensure", function(_, chunk, hash) {
 			const chunkFilename = this.outputOptions.chunkFilename;
 			return this.asString([
-				"// \"1\" is the signal for \"already loaded\"",
-				"if(!installedChunks[chunkId]) {",
+				"return new Promise(function(resolve) {",
 				this.indent([
-					"importScripts(" +
-					this.applyPluginsWaterfall("asset-path", JSON.stringify(chunkFilename), {
-						hash: "\" + " + this.renderCurrentHashCode(hash) + " + \"",
-						hashWithLength: function(length) {
-							return "\" + " + this.renderCurrentHashCode(hash, length) + " + \"";
-						}.bind(this),
-						chunk: {
-							id: "\" + chunkId + \""
-						}
-					}) + ");"
+					"// \"1\" is the signal for \"already loaded\"",
+					"if(!installedChunks[chunkId]) {",
+					this.indent([
+						"importScripts(" +
+						this.applyPluginsWaterfall("asset-path", JSON.stringify(chunkFilename), {
+							hash: "\" + " + this.renderCurrentHashCode(hash) + " + \"",
+							hashWithLength: function(length) {
+								return "\" + " + this.renderCurrentHashCode(hash, length) + " + \"";
+							}.bind(this),
+							chunk: {
+								id: "\" + chunkId + \""
+							}
+						}) + ");"
+					]),
+					"}",
+					"resolve();"
 				]),
-				"}",
-				"return resolvedPromise;"
+				"});"
 			]);
 		});
 		mainTemplate.plugin("bootstrap", function(source, chunk, hash) {
diff --git a/test/WebWorkerMainTemplatePlugin.test.js b/test/WebWorkerMainTemplatePlugin.test.js
index f8019ecd29f..b8dc01b1941 100644
--- a/test/WebWorkerMainTemplatePlugin.test.js
+++ b/test/WebWorkerMainTemplatePlugin.test.js
@@ -85,8 +85,6 @@ var installedChunks = {
 2: 1,
 3: 1
 };
-
-var resolvedPromise = new Promise(function(resolve) { resolve(); });
 `.trim())
 				});
 			});
@@ -109,11 +107,13 @@ var resolvedPromise = new Promise(function(resolve) { resolve(); });
 
 				it("creates import scripts call and promise resolve", () => {
 					env.source.should.be.exactly(`
+return new Promise(function(resolve) {
 // "1" is the signal for "already loaded"
 if(!installedChunks[chunkId]) {
 importScripts("asset-path" + abc123 + "" + abc123 + "" + chunkId + "");
 }
-return resolvedPromise;
+resolve();
+});
 `.trim())
 				});
 			});
diff --git a/test/statsCases/commons-chunk-min-size-0/expected.txt b/test/statsCases/commons-chunk-min-size-0/expected.txt
index d56bbc66c7e..a5025646bff 100644
--- a/test/statsCases/commons-chunk-min-size-0/expected.txt
+++ b/test/statsCases/commons-chunk-min-size-0/expected.txt
@@ -2,7 +2,7 @@ Hash: dc6038bec87a57d1a45e
 Time: Xms
       Asset      Size  Chunks             Chunk Names
  entry-1.js  25 bytes       0  [emitted]  entry-1
-vendor-1.js   6.92 kB       1  [emitted]  vendor-1
+vendor-1.js   6.93 kB       1  [emitted]  vendor-1
 chunk    {0} entry-1.js (entry-1) 0 bytes {1} [initial] [rendered]
 chunk    {1} vendor-1.js (vendor-1) 329 bytes [entry] [rendered]
     [0] (webpack)/test/statsCases/commons-chunk-min-size-0/modules/a.js 22 bytes {1} [built]
diff --git a/test/statsCases/limit-chunk-count-plugin/expected.txt b/test/statsCases/limit-chunk-count-plugin/expected.txt
index 6e558fdfeb5..d3349caff30 100644
--- a/test/statsCases/limit-chunk-count-plugin/expected.txt
+++ b/test/statsCases/limit-chunk-count-plugin/expected.txt
@@ -31,7 +31,7 @@ Child
           Asset       Size  Chunks             Chunk Names
     0.bundle.js  445 bytes       0  [emitted]  
     1.bundle.js  204 bytes       1  [emitted]  
-      bundle.js    6.27 kB       2  [emitted]  main
+      bundle.js    6.28 kB       2  [emitted]  main
     chunk    {0} 0.bundle.js 74 bytes {2} [rendered]
         [0] (webpack)/test/statsCases/limit-chunk-count-plugin/a.js 22 bytes {0} [built]
         [2] (webpack)/test/statsCases/limit-chunk-count-plugin/c.js 30 bytes {0} [built]