diff --git a/packages/popper/.npmignore b/packages/popper/.npmignore
index 9f9002d6a8..aa1bd814c7 100644
--- a/packages/popper/.npmignore
+++ b/packages/popper/.npmignore
@@ -6,3 +6,4 @@
 #======================
 !dist/**/*
 !index.d.ts
+!index.js.flow