Index: Python/pythonrun.c
===================================================================
--- Python/pythonrun.c	(revision 62744)
+++ Python/pythonrun.c	(working copy)
@@ -764,8 +764,8 @@
 #endif
 	}
 	else {
-		if (!(std = PyFile_FromFd(fd, "<stdout>", "w", -1, NULL, NULL,
-					  "\n", 0))) {
+		if (!(std = PyFile_FromFd(fd, "<stdout>", "w", -1, NULL,
+					  "backslashreplace", "\n", 0))) {
 			goto error;
 		}
 	} /* if (fd < 0) */
@@ -785,8 +785,8 @@
 #endif
 	}
 	else {
-		if (!(std = PyFile_FromFd(fd, "<stderr>", "w", -1, NULL, NULL,
-					  "\n", 0))) {
+		if (!(std = PyFile_FromFd(fd, "<stderr>", "w", -1, NULL,
+					  "backslashreplace", "\n", 0))) {
 			goto error;
 		}
 	} /* if (fd < 0) */