diff --git a/packages/webpack-loader-runtime/src/index.ts b/packages/webpack-loader-runtime/src/index.ts
index 064d561568f..ddb30fa2887 100644
--- a/packages/webpack-loader-runtime/src/index.ts
+++ b/packages/webpack-loader-runtime/src/index.ts
@@ -1,11 +1,11 @@
 import { DefinitionNode } from 'graphql';
 
 export const uniqueCode = `
-  const names = {};
+  var names = {};
   function unique(defs) {
-    return defs.filter((def) => {
+    return defs.filter(function (def) {
       if (def.kind !== 'FragmentDefinition') return true;
-      const name = def.name.value;
+      var name = def.name.value;
       if (names[name]) {
         return false;
       } else {
diff --git a/packages/webpack-loader/src/index.ts b/packages/webpack-loader/src/index.ts
index 22fbc39d475..c5c95bc2483 100644
--- a/packages/webpack-loader/src/index.ts
+++ b/packages/webpack-loader/src/index.ts
@@ -43,9 +43,8 @@ function expandImports(source: string, options: Options) {
   const lines = source.split(/\r\n|\r|\n/);
   let outputCode = options.importHelpers
     ? `
-    const { useUnique } = require('@graphql-tools/webpack-loader-runtime');
-
-    const unique = useUnique();
+    var useUnique = require('@graphql-tools/webpack-loader-runtime').useUnique;
+    var unique = useUnique();
   `
     : `
     ${uniqueCode}
@@ -75,7 +74,7 @@ export default function graphqlLoader(source: string) {
   }
 
   const headerCode = `
-    const doc = ${JSON.stringify(doc)};
+    var doc = ${JSON.stringify(doc)};
   `;
 
   let outputCode = '';
diff --git a/packages/webpack-loader/tests/loader.test.ts b/packages/webpack-loader/tests/loader.test.ts
index 9ade6c7b55c..3f1d8e8ef81 100644
--- a/packages/webpack-loader/tests/loader.test.ts
+++ b/packages/webpack-loader/tests/loader.test.ts
@@ -15,7 +15,7 @@ test('basic query', () => {
   `;
   const doc = useLoader(docStr, {});
 
-  const docLine = `const doc = ${JSON.stringify(parse(docStr, { noLocation: true }))};`;
+  const docLine = `var doc = ${JSON.stringify(parse(docStr, { noLocation: true }))};`;
   const exportLine = `module.exports = doc`;
 
   expect(doc).toContain(docLine);
@@ -43,7 +43,7 @@ test('basic query with esModules on', () => {
     esModule: true
   });
 
-  const docLine = `const doc = ${JSON.stringify(parse(docStr, { noLocation: true }))};`;
+  const docLine = `var doc = ${JSON.stringify(parse(docStr, { noLocation: true }))};`;
   const exportLine = `export default doc`;
 
   expect(doc).toContain(docLine);