diff --git a/rebase.c b/rebase.c
index 9504a48..a078e1d 100644
--- a/rebase.c
+++ b/rebase.c
@@ -288,7 +288,7 @@ mkstemp (char *name)
 {
   return _open (mktemp (name),
       O_RDWR | O_BINARY | O_CREAT | O_EXCL | O_TRUNC | _O_SHORT_LIVED,
-      _S_IREAD|_S_IWRITE);
+      _S_IREAD|_S_IWRITE|S_IRGRP|S_IROTH);
 }
 #endif