diff --git a/src/index.js b/src/index.js
index d0c66d4e..98278923 100644
--- a/src/index.js
+++ b/src/index.js
@@ -3,6 +3,7 @@
   Author Tobias Koppers @sokra
 */
 
+import crypto from 'crypto';
 import { SourceMapConsumer } from 'source-map';
 import { SourceMapSource, RawSource, ConcatSource } from 'webpack-sources';
 import RequestShortener from 'webpack/lib/RequestShortener';
@@ -160,7 +161,7 @@ class UglifyJsPlugin {
                   'uglifyjs-webpack-plugin': versions.plugin,
                   'uglifyjs-webpack-plugin-options': this.options,
                   path: compiler.outputPath ? `${compiler.outputPath}/${file}` : file,
-                  input,
+                  hash: crypto.createHash('md5').update(input).digest('hex'),
                 });
               }
 
diff --git a/test/__snapshots__/cache-options.test.js.snap b/test/__snapshots__/cache-options.test.js.snap
index 8698182c..5d6b3b5d 100644
--- a/test/__snapshots__/cache-options.test.js.snap
+++ b/test/__snapshots__/cache-options.test.js.snap
@@ -23,56 +23,56 @@ exports[`cache \`true\`: asset manifest.6afe1bc6685e9ab36c1c.js 1`] = `"!functio
 exports[`cache \`true\`: cached entry test.js 1`] = `
 Array [
   "test.js",
-  "function test(foo) { foo = 1; }",
+  "46adcef6cf434fbddbc275218b3e093a",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test.js 2`] = `
 Array [
   "test.js",
-  "function test(foo) { foo = 1; }",
+  "46adcef6cf434fbddbc275218b3e093a",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test1.js 1`] = `
 Array [
   "test1.js",
-  "function test1(foo) { foo = 1; }",
+  "6b6ccbbe331608e36cded49fd411c373",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test1.js 2`] = `
 Array [
   "test1.js",
-  "function test1(foo) { foo = 1; }",
+  "6b6ccbbe331608e36cded49fd411c373",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test2.js 1`] = `
 Array [
   "test2.js",
-  "function test2(foo) { foo = 1; }",
+  "975b72a762ef408dcf46a574fead7e60",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test2.js 2`] = `
 Array [
   "test2.js",
-  "function test2(foo) { foo = 1; }",
+  "975b72a762ef408dcf46a574fead7e60",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test3.js 1`] = `
 Array [
   "test3.js",
-  "function test3(foo) { foo = 1; }",
+  "fa894d635dc764c42fb6b1d4e3f6ed2b",
 ]
 `;
 
 exports[`cache \`true\`: cached entry test3.js 2`] = `
 Array [
   "test3.js",
-  "function test3(foo) { foo = 1; }",
+  "fa894d635dc764c42fb6b1d4e3f6ed2b",
 ]
 `;
 
diff --git a/test/cache-options.test.js b/test/cache-options.test.js
index c8709354..0b4da69d 100644
--- a/test/cache-options.test.js
+++ b/test/cache-options.test.js
@@ -243,7 +243,7 @@ describe('when options.cache', () => {
                     // eslint-disable-next-line no-new-func
                     const cacheEntryOptions = new Function(`'use strict'\nreturn ${cacheEntry}`)();
 
-                    expect([cacheEntryOptions.path, cacheEntryOptions.input])
+                    expect([cacheEntryOptions.path, cacheEntryOptions.hash])
                       .toMatchSnapshot(`cache \`true\`: cached entry ${cacheEntryOptions.path}`);
                   });
 
@@ -389,7 +389,7 @@ describe('when options.cache', () => {
                     // eslint-disable-next-line no-new-func
                     const cacheEntryOptions = new Function(`'use strict'\nreturn ${cacheEntry}`)();
 
-                    expect([cacheEntryOptions.path, cacheEntryOptions.input])
+                    expect([cacheEntryOptions.path, cacheEntryOptions.hash])
                       .toMatchSnapshot(`cache \`true\`: cached entry ${cacheEntryOptions.path}`);
                   });