diff --git a/.npmignore b/.npmignore
index dcc90565..6a6c1468 100644
--- a/.npmignore
+++ b/.npmignore
@@ -4,4 +4,5 @@ circle.yml
 external.jsdoc
 example/
 jsdoc/
-test/
\ No newline at end of file
+test/
+.c9/