diff --git a/internal/nbconn/nbconn_fake_non_block.go b/internal/nbconn/nbconn_fake_non_block.go
index cf05df1c..4915c621 100644
--- a/internal/nbconn/nbconn_fake_non_block.go
+++ b/internal/nbconn/nbconn_fake_non_block.go
@@ -1,9 +1,7 @@
-//go:build !(aix || android || darwin || dragonfly || freebsd || hurd || illumos || ios || linux || netbsd || openbsd || solaris)
+//go:build !unix
 
 package nbconn
 
-// Not using unix build tag for support on Go 1.18.
-
 func (c *NetConn) realNonblockingWrite(b []byte) (n int, err error) {
 	return c.fakeNonblockingWrite(b)
 }
diff --git a/internal/nbconn/nbconn_real_non_block.go b/internal/nbconn/nbconn_real_non_block.go
index 6d554769..e93372f2 100644
--- a/internal/nbconn/nbconn_real_non_block.go
+++ b/internal/nbconn/nbconn_real_non_block.go
@@ -1,9 +1,7 @@
-//go:build aix || android || darwin || dragonfly || freebsd || hurd || illumos || ios || linux || netbsd || openbsd || solaris
+//go:build unix
 
 package nbconn
 
-// Not using unix build tag for support on Go 1.18.
-
 import (
 	"errors"
 	"io"