diff --git a/pupy/packages/all/pupyutils/safepopen.py b/pupy/packages/all/pupyutils/safepopen.py
index 9887c8e4..9a8bc7a0 100644
--- a/pupy/packages/all/pupyutils/safepopen.py
+++ b/pupy/packages/all/pupyutils/safepopen.py
@@ -88,6 +88,7 @@ class SafePopen(object):
     def __init__(self, *popen_args, **popen_kwargs):
         self._popen_args = popen_args
         self._interactive = popen_kwargs.pop('interactive', False)
+        self._stdin_data = popen_kwargs.pop('stdin_data', None)
         self._suid = popen_kwargs.pop('suid', None)
 
         if not ON_POSIX:
@@ -139,6 +140,10 @@ class SafePopen(object):
                 **kwargs
             )
 
+            if self._stdin_data:
+                self._pipe.stdin.write(self._stdin_data)
+                self._pipe.stdin.flush()
+
             if not self._interactive:
                 self._pipe.stdin.close()