diff --git a/unix/gccgo_c.c b/unix/gccgo_c.c
index c4fce0e..f98a1c5 100644
--- a/unix/gccgo_c.c
+++ b/unix/gccgo_c.c
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build gccgo,!hurd
-// +build !aix,!hurd
+//go:build gccgo && !aix && !hurd
+// +build gccgo,!aix,!hurd
 
 #include <errno.h>
 #include <stdint.h>