diff --git a/packages/react-transport-dom-relay/src/__mocks__/JSResourceReference.js b/packages/react-transport-dom-relay/src/__mocks__/JSResourceReference.js
index cf0cc624a9816..18dab0739c650 100644
--- a/packages/react-transport-dom-relay/src/__mocks__/JSResourceReference.js
+++ b/packages/react-transport-dom-relay/src/__mocks__/JSResourceReference.js
@@ -11,7 +11,7 @@ class JSResourceReference {
   constructor(exportedValue) {
     this._moduleId = exportedValue;
   }
-  getModuleID() {
+  getModuleId() {
     return this._moduleId;
   }
 }
diff --git a/packages/shared/isValidElementType.js b/packages/shared/isValidElementType.js
index 75c5fa74c5b7f..57e3d249b998c 100644
--- a/packages/shared/isValidElementType.js
+++ b/packages/shared/isValidElementType.js
@@ -64,7 +64,7 @@ export default function isValidElementType(type: mixed) {
       // we don't know which Flight build this will end up being used
       // with.
       type.$$typeof === REACT_MODULE_REFERENCE ||
-      type.getModuleID !== undefined ||
+      type.getModuleId !== undefined ||
       type.$$typeof === REACT_BLOCK_TYPE ||
       type[(0: any)] === REACT_SERVER_BLOCK_TYPE
     ) {