diff --git a/lib/puma/server.rb b/lib/puma/server.rb
index 7fb1a58f..4b85de21 100644
--- a/lib/puma/server.rb
+++ b/lib/puma/server.rb
@@ -596,7 +596,7 @@ module Puma
 
     def fast_write(io, str)
       n = 0
-      loop do
+      while true
         begin
           n = io.syswrite str
         rescue Errno::EAGAIN, Errno::EWOULDBLOCK