diff --git a/lib/colorls/git.rb b/lib/colorls/git.rb
index 3b2102bf..cf3f75d7 100644
--- a/lib/colorls/git.rb
+++ b/lib/colorls/git.rb
@@ -52,7 +52,7 @@ class << self
 
       def git_prefix(repo_path)
         [
-          IO.popen(['git', '-C', repo_path, 'rev-parse', '--show-prefix'], err: :close, &:gets)&.chomp,
+          IO.popen(['git', '-C', repo_path, 'rev-parse', '--show-prefix'], err: File::NULL, &:gets)&.chomp,
           $CHILD_STATUS.success?
         ]
       rescue Errno::ENOENT