go/cm/enc/chapoly/dem.go | 2 +-

diff --git a/go/cm/enc/chapoly/dem.go b/go/cm/enc/chapoly/dem.go
index 7f59487205f5c1598be2e3b740e5c07635f9e307e3ad7e2aa04b761a3592f3a8..5a7eafc145f312c0e6b16767ef716531bf7445aad6229fab616c3c96b85401d7 100644
--- a/go/cm/enc/chapoly/dem.go
+++ b/go/cm/enc/chapoly/dem.go
@@ -252,7 +252,7 @@ 			}
 		}
 		total += int64(n)
 		if errR != nil {
-			if !(errR == io.ErrUnexpectedEOF || errR == io.EOF) {
+			if errR != io.ErrUnexpectedEOF && errR != io.EOF {
 				err = errR
 				close(dones)
 				<-finished