diff --git a/packages/babel-standalone/src/preset-stage-1.ts b/packages/babel-standalone/src/preset-stage-1.ts
index 67a3ef331819..9b786c2e4927 100644
--- a/packages/babel-standalone/src/preset-stage-1.ts
+++ b/packages/babel-standalone/src/preset-stage-1.ts
@@ -33,6 +33,7 @@ export default (_: any, opts: any = {}) => {
       babelPlugins.syntaxDecimal,
       babelPlugins.proposalExportDefaultFrom,
       babelPlugins.proposalDoExpressions,
+      babelPlugins.optionalChainingAssign
     ],
   };
 };
diff --git a/packages/babel-standalone/test/preset-stage-1.test.js b/packages/babel-standalone/test/preset-stage-1.test.js
index fb098d587d49..71588749e183 100644
--- a/packages/babel-standalone/test/preset-stage-1.test.js
+++ b/packages/babel-standalone/test/preset-stage-1.test.js
@@ -78,4 +78,10 @@ describe("stage-1 preset", () => {
     }).code;
     expect(output).toMatchInlineSnapshot(`"Tuple(Record({}));"`);
   });
+  it("should support optional chaining assignment", () => {
+    const output = Babel.transform("expr1?.prop = val", {
+      presets: [["stage-1", { decoratorsVersion: "2021-12" }]],
+    }).code;
+    expect(output).toMatchInlineSnapshot(`"expr1 == null ? undefined : expr1.prop = val;"`);
+  });
 });