diff --git a/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/actual.js b/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/actual.js
new file mode 100644
index 0000000000..593242cde2
--- /dev/null
+++ b/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/actual.js
@@ -0,0 +1,6 @@
+class C {
+    // Output should not use `_initialiseProps`
+    x: T;
+    y = 0;
+    constructor(T) {}
+}
diff --git a/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/expected.js b/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/expected.js
new file mode 100644
index 0000000000..688eb31db9
--- /dev/null
+++ b/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/expected.js
@@ -0,0 +1,8 @@
+class C {
+  // Output should not use `_initialiseProps`
+  constructor(T) {
+    this.x = void 0;
+    this.y = 0;
+  }
+
+}
diff --git a/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/options.json b/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/options.json
new file mode 100644
index 0000000000..dcd8e9fbcf
--- /dev/null
+++ b/packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types-loose/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-typescript", ["transform-class-properties", {"loose": true }]]
+}