diff --git a/src/renderers/shared/fiber/ReactFiberDevToolsHook.js b/src/renderers/shared/fiber/ReactFiberDevToolsHook.js
index b7a2d1fa9e..dbd0c98213 100644
--- a/src/renderers/shared/fiber/ReactFiberDevToolsHook.js
+++ b/src/renderers/shared/fiber/ReactFiberDevToolsHook.js
@@ -12,15 +12,15 @@
 
 'use strict';
 
-if (__DEV__) {
-  var warning = require('fbjs/lib/warning');
-}
-
 import type {Fiber} from 'ReactFiber';
 import type {FiberRoot} from 'ReactFiberRoot';
 
 declare var __REACT_DEVTOOLS_GLOBAL_HOOK__: Object | void;
 
+if (__DEV__) {
+  var warning = require('fbjs/lib/warning');
+}
+
 let rendererID = null;
 let injectInternals = null;
 let onCommitRoot = null;
@@ -36,7 +36,9 @@ if (
   } = __REACT_DEVTOOLS_GLOBAL_HOOK__;
 
   injectInternals = function(internals: Object) {
-    warning(rendererID == null, 'Cannot inject into DevTools twice.');
+    if (__DEV__) {
+      warning(rendererID == null, 'Cannot inject into DevTools twice.');
+    }
     rendererID = inject(internals);
   };