diff --git a/packages/react-devtools-shared/src/devtools/store.js b/packages/react-devtools-shared/src/devtools/store.js
index c795e23263985..c0083f90a16e4 100644
--- a/packages/react-devtools-shared/src/devtools/store.js
+++ b/packages/react-devtools-shared/src/devtools/store.js
@@ -77,7 +77,6 @@ export default class Store extends EventEmitter<{|
   supportsProfiling: [],
   supportsReloadAndProfile: [],
   unsupportedRendererVersionDetected: [],
-  isSynchronousXHRSupported: [],
 |}> {
   _bridge: FrontendBridge;