diff --git a/Library/Homebrew/utils/popen.rb b/Library/Homebrew/utils/popen.rb
index 36966a5252..36c2b65851 100644
--- a/Library/Homebrew/utils/popen.rb
+++ b/Library/Homebrew/utils/popen.rb
@@ -28,7 +28,7 @@ module Utils
 
       yield pipe
       pipe.close_write
-      IO.select([pipe])
+      pipe.wait_readable
 
       # Capture the rest of the output
       output += pipe.read