diff --git a/collects/mzlib/process.ss b/collects/mzlib/process.ss
index d04f384..7a12c88 100644
--- a/collects/mzlib/process.ss
+++ b/collects/mzlib/process.ss
@@ -62,7 +62,7 @@
 			       (lambda ()
 				 (with-handlers ([exn:break? void])
 				   (ready-for-break #t)
-				   (copy-port cin in)
+                                   (copy-port cin in)
 				   (ready-for-break #f)))
 			       (lambda () (close-output-port in)))
 			   (ready-for-break #t)))])