diff --git a/src/stdlib/fs-utils.coffee b/src/stdlib/fs-utils.coffee
index c1ca0beed..45fcf3014 100644
--- a/src/stdlib/fs-utils.coffee
+++ b/src/stdlib/fs-utils.coffee
@@ -319,6 +319,9 @@ module.exports =
   isBinaryExtension: (ext) ->
     _.indexOf([
       '.DS_Store'
+      '.a'
+      '.o'
+      '.so'
       '.woff'
     ], ext, true) >= 0