--- a/ExternalStream.st	Tue Dec 29 06:40:21 2015 +0100
+++ b/ExternalStream.st	Wed Dec 30 07:00:31 2015 +0100
@@ -5455,9 +5455,9 @@
      We know, that error conditions do not block, so return true for errors."
 
     ^ readAhead notNil
-        or:[handle isNil]
+        or:[handle isNil
         or:[mode == #writeonly
-        or:[OperatingSystem readCheck:self fileDescriptor]]
+        or:[OperatingSystem readCheck:self fileDescriptor]]]
 
     "
      |pipe|