diff --git a/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc/initProto-existing-derived-constructor/exec.js b/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/exec.js
similarity index 100%
rename from packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc/initProto-existing-derived-constructor/exec.js
rename to packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/exec.js
diff --git a/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/input.js b/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/input.js
new file mode 100644
index 0000000000..d72d66fd2a
--- /dev/null
+++ b/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/input.js
@@ -0,0 +1,10 @@
+class A extends B {
+  constructor() {
+    let a = 2;
+    super(a);
+    foo();
+  }
+
+  @deco
+  method() {}
+}
diff --git a/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/output.js b/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/output.js
new file mode 100644
index 0000000000..61a1fde840
--- /dev/null
+++ b/packages/babel-plugin-proposal-decorators/test/fixtures/2021-12-misc--to-es2015/initProto-existing-derived-constructor/output.js
@@ -0,0 +1,18 @@
+var _initProto;
+
+class A extends B {
+  constructor() {
+    let a = 2;
+
+    _initProto(super(a));
+
+    foo();
+  }
+
+  method() {}
+
+}
+
+(() => {
+  [_initProto] = babelHelpers.applyDecs(A, [[deco, 2, "method"]], []);
+})();