diff --git a/ext/openssl/lib/openssl/buffering.rb b/ext/openssl/lib/openssl/buffering.rb
index 1f2b2a7e44..5d1586e594 100644
--- a/ext/openssl/lib/openssl/buffering.rb
+++ b/ext/openssl/lib/openssl/buffering.rb
@@ -316,20 +316,15 @@ def do_write(s)
     @wbuffer << s
     @wbuffer.force_encoding(Encoding::BINARY)
     @sync ||= false
-    if @sync or @wbuffer.size > BLOCK_SIZE or idx = @wbuffer.rindex("\n")
-      remain = idx ? idx + 1 : @wbuffer.size
-      nwritten = 0
-      while remain > 0
-        str = @wbuffer[nwritten,remain]
+    if @sync or @wbuffer.size > BLOCK_SIZE
+      until @wbuffer.empty?
         begin
-          nwrote = syswrite(str)
+          nwrote = syswrite(@wbuffer)
         rescue Errno::EAGAIN
           retry
         end
-        remain -= nwrote
-        nwritten += nwrote
+        @wbuffer[0, nwrote] = ""
       end
-      @wbuffer[0,nwritten] = ""
     end
   end