diff --git a/common/buf/readv_reader_windows.go b/common/buf/readv_reader_windows.go
index 32a834a1..743e9a53 100644
--- a/common/buf/readv_reader_windows.go
+++ b/common/buf/readv_reader_windows.go
@@ -7,8 +7,8 @@ import (
 	"syscall"
 )
 
-var useReadv = false
+const useReadv = false
 
 func NewReadVReader(reader io.Reader, rawConn syscall.RawConn) Reader {
-	return nil
+	panic("Shoud not happen")
 }