diff --git a/scour/scour.py b/scour/scour.py
index e91d385..00d8c7b 100644
--- a/scour/scour.py
+++ b/scour/scour.py
@@ -3794,9 +3794,9 @@ def start(options, input, output):
     output.write(out_string)
 
     # Close input and output files (but do not attempt to close stdin/stdout!)
-    if not ((input is sys.stdin) or (hasattr(input, 'buffer') and input is sys.stdin.buffer)):
+    if not ((input is sys.stdin) or (hasattr(sys.stdin, 'buffer') and input is sys.stdin.buffer)):
         input.close()
-    if not ((output is sys.stdout) or (hasattr(output, 'buffer') and output is sys.stdout.buffer)):
+    if not ((output is sys.stdout) or (hasattr(sys.stdout, 'buffer') and output is sys.stdout.buffer)):
         output.close()
 
     end = walltime()