diff --git a/src/apis/StyleSheet/flattenStyle.js b/src/apis/StyleSheet/flattenStyle.js
index ae914b44..19fe44e1 100644
--- a/src/apis/StyleSheet/flattenStyle.js
+++ b/src/apis/StyleSheet/flattenStyle.js
@@ -24,7 +24,7 @@ function flattenStyle(style) {
     return undefined;
   }
 
-  if (process.env.NODE !== 'production') {
+  if (process.env.NODE_ENV !== 'production') {
     invariant(style !== true, 'style may be false but not true');
   }