diff --git a/playground/__tests__/cli.test.js b/playground/__tests__/cli.test.js
index 3379fd6..322f416 100644
--- a/playground/__tests__/cli.test.js
+++ b/playground/__tests__/cli.test.js
@@ -26,4 +26,16 @@ describe('Test the config-sync CLI', () => {
     const { stdout } = await exec('yarn cs diff');
     expect(stdout).toContain('No differences between DB and sync directory');
   });
+  test('Non-empty diff returns 1', async () => {
+    await exec('rm -rf config/sync/admin-role.strapi-author.json');
+    // Work around Jest not supporting custom error matching.
+    // https://github.com/facebook/jest/issues/8140
+    let error;
+    try {
+      await exec('yarn cs diff');
+    } catch(e) {
+     error = e;
+    }
+    expect(error).toHaveProperty('code', 1);
+  });
 });
diff --git a/server/cli.js b/server/cli.js
index f8c6273..c82b068 100644
--- a/server/cli.js
+++ b/server/cli.js
@@ -269,7 +269,7 @@ program
         { color: true },
       ));
 
-      process.exit(0);
+      process.exit(1);
     }
 
     // Init table.
@@ -283,7 +283,7 @@ program
     // Print table.
     console.log(table.toString());
 
-    process.exit(0);
+    process.exit(1);
   });
 
 program.parseAsync(process.argv);