diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index eb1a735..8b25c2f 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -1111,6 +1111,7 @@
                 read_set.append(self.stderr)
                 stderr = []
 
+            input_offset = 0
             while read_set or write_set:
                 rlist, wlist, xlist = select.select(read_set, write_set, [])
 
@@ -1118,9 +1119,9 @@
                     # When select has indicated that the file is writable,
                     # we can write up to PIPE_BUF bytes without risk
                     # blocking.  POSIX defines PIPE_BUF >= 512
-                    bytes_written = os.write(self.stdin.fileno(), input[:512])
-                    input = input[bytes_written:]
-                    if not input:
+                    bytes_written = os.write(self.stdin.fileno(), buffer(input, input_offset, 512))
+                    input_offset += bytes_written 
+                    if input_offset >= len(input):
                         self.stdin.close()
                         write_set.remove(self.stdin)