diff --git a/Lib/site.py b/Lib/site.py
index 4d64d20..3ba4212 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -247,7 +247,12 @@
             # Shells like IDLE catch the SystemExit, but listen when their
             # stdin wrapper is closed.
             try:
-                sys.stdin.close()
+                fd = -1
+                if hasattr(sys.stdin, "fileno"):
+                    fd = sys.stdin.fileno()
+                if fd != 0:
+                    # Don't close stdin if it wraps fd 0
+                    sys.stdin.close()
             except:
                 pass
             raise SystemExit(code)