diff --git a/packages/babel-helper-create-class-features-plugin/src/index.js b/packages/babel-helper-create-class-features-plugin/src/index.js
index 760be4af9657..6ad46288f9de 100644
--- a/packages/babel-helper-create-class-features-plugin/src/index.js
+++ b/packages/babel-helper-create-class-features-plugin/src/index.js
@@ -54,9 +54,7 @@ export function createClassFeaturePlugin({
 
         verifyUsedFeatures(path, this.file);
 
-        // Only fields are currently supported, this needs to be moved somewhere
-        // else when other features are added.
-        const loose = isLoose(this.file, FEATURES.fields);
+        const loose = isLoose(this.file, feature);
 
         let constructor;
         let isDecorated = hasOwnDecorators(path.node);
diff --git a/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/input.js b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/input.js
new file mode 100644
index 000000000000..40fba0a0a941
--- /dev/null
+++ b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/input.js
@@ -0,0 +1,5 @@
+class X {
+  #privateMethod() {
+    return 42;
+  }
+}
diff --git a/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/options.json b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/options.json
new file mode 100644
index 000000000000..f85119d087cc
--- /dev/null
+++ b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["proposal-private-methods", { "loose": false }]
+  ]
+}
diff --git a/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/output.js b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/output.js
new file mode 100644
index 000000000000..2a500530b640
--- /dev/null
+++ b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-false/output.js
@@ -0,0 +1,12 @@
+class X {
+  constructor() {
+    _privateMethod.add(this);
+  }
+
+}
+
+var _privateMethod = new WeakSet();
+
+var _privateMethod2 = function _privateMethod2() {
+  return 42;
+};
diff --git a/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/input.js b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/input.js
new file mode 100644
index 000000000000..40fba0a0a941
--- /dev/null
+++ b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/input.js
@@ -0,0 +1,5 @@
+class X {
+  #privateMethod() {
+    return 42;
+  }
+}
diff --git a/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/options.json b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/options.json
new file mode 100644
index 000000000000..e0ee1124a93a
--- /dev/null
+++ b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/options.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    ["proposal-private-methods", { "loose": true }]
+  ]
+}
diff --git a/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/output.js b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/output.js
new file mode 100644
index 000000000000..a660b0038d59
--- /dev/null
+++ b/packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-private-methods/loose-true/output.js
@@ -0,0 +1,18 @@
+var id = 0;
+
+function _classPrivateFieldLooseKey(name) { return "__private_" + id++ + "_" + name; }
+
+class X {
+  constructor() {
+    Object.defineProperty(this, _privateMethod, {
+      value: _privateMethod2
+    });
+  }
+
+}
+
+var _privateMethod = _classPrivateFieldLooseKey("privateMethod");
+
+var _privateMethod2 = function _privateMethod2() {
+  return 42;
+};