diff --git a/unix/endian_little.go b/unix/endian_little.go
index 085df2d8..bcdb5d30 100644
--- a/unix/endian_little.go
+++ b/unix/endian_little.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
-// +build 386 amd64 amd64p32 arm arm64 ppc64le mipsle mips64le
+// +build 386 amd64 amd64p32 arm arm64 ppc64le mipsle mips64le riscv64
 
 package unix