diff --git a/packages/mui-material-next/src/Tabs/Tabs.test.js b/packages/mui-material-next/src/Tabs/Tabs.test.js
index 9d17ac411e1107..3c894e825c13e1 100644
--- a/packages/mui-material-next/src/Tabs/Tabs.test.js
+++ b/packages/mui-material-next/src/Tabs/Tabs.test.js
@@ -338,11 +338,21 @@ describe('<Tabs />', () => {
 
           nodeEnv = process.env.NODE_ENV;
           // We can't use a regular assignment, because it causes a syntax error in Karma
-          Object.defineProperty(process.env, 'NODE_ENV', { value: 'development' });
+          Object.defineProperty(process.env, 'NODE_ENV', {
+            value: 'development',
+            configurable: true,
+            writable: true,
+            enumerable: true,
+          });
         });
 
         after(() => {
-          Object.defineProperty(process.env, 'NODE_ENV', { value: nodeEnv });
+          Object.defineProperty(process.env, 'NODE_ENV', {
+            value: nodeEnv,
+            configurable: true,
+            writable: true,
+            enumerable: true,
+          });
         });
 
         it('should warn if a Tab has display: none', () => {
diff --git a/packages/mui-material/src/Tabs/Tabs.test.js b/packages/mui-material/src/Tabs/Tabs.test.js
index afeffea0d3e229..16ecb2c42c39c4 100644
--- a/packages/mui-material/src/Tabs/Tabs.test.js
+++ b/packages/mui-material/src/Tabs/Tabs.test.js
@@ -375,11 +375,21 @@ describe('<Tabs />', () => {
 
           nodeEnv = process.env.NODE_ENV;
           // We can't use a regular assignment, because it causes a syntax error in Karma
-          Object.defineProperty(process.env, 'NODE_ENV', { value: 'development' });
+          Object.defineProperty(process.env, 'NODE_ENV', {
+            value: 'development',
+            configurable: true,
+            writable: true,
+            enumerable: true,
+          });
         });
 
         after(() => {
-          Object.defineProperty(process.env, 'NODE_ENV', { value: nodeEnv });
+          Object.defineProperty(process.env, 'NODE_ENV', {
+            value: nodeEnv,
+            configurable: true,
+            writable: true,
+            enumerable: true,
+          });
         });
 
         it('should warn if a `Tab` has display: none', function test() {