diff --git a/packages/babel-plugin-proposal-class-properties/src/index.js b/packages/babel-plugin-proposal-class-properties/src/index.js
index 62ea9ec1ecfe..ca5a426b5548 100644
--- a/packages/babel-plugin-proposal-class-properties/src/index.js
+++ b/packages/babel-plugin-proposal-class-properties/src/index.js
@@ -71,7 +71,9 @@ export default declare((api, options) => {
       const body = path.get("body.body");
 
       for (const prop of body) {
-        if (!prop.isClassPrivateProperty()) continue;
+        if (!prop.isClassPrivateProperty() && !prop.isClassPrivateMethod()) {
+          continue;
+        }
         if (prop.node.key.id.name !== name) continue;
 
         // This class redeclares the private name.
@@ -368,7 +370,7 @@ export default declare((api, options) => {
             );
           }
 
-          if (path.isClassPrivateProperty()) {
+          if (path.isClassPrivateProperty() || path.isClassPrivateMethod()) {
             const { static: isStatic, key: { id: { name } } } = path.node;
 
             if (isStatic) {
diff --git a/packages/babel-types/src/definitions/es2015.js b/packages/babel-types/src/definitions/es2015.js
index 26c0d4a34473..9ccf5f2508e7 100644
--- a/packages/babel-types/src/definitions/es2015.js
+++ b/packages/babel-types/src/definitions/es2015.js
@@ -89,6 +89,7 @@ defineType("ClassBody", {
             "ClassMethod",
             "ClassProperty",
             "ClassPrivateProperty",
+            "ClassPrivateMethod",
             "TSDeclareMethod",
             "TSIndexSignature",
           ),