diff --git a/unix/race.go b/unix/race.go
index be324338..03d60dd1 100644
--- a/unix/race.go
+++ b/unix/race.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 darwin,race dragonfly,race freebsd,race linux,race netbsd,race openbsd,race
+// +build darwin,race linux,race
 
 package unix
 
diff --git a/unix/race0.go b/unix/race0.go
index 9ded70a4..d6de6196 100644
--- a/unix/race0.go
+++ b/unix/race0.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 darwin,!race dragonfly,!race freebsd,!race linux,!race netbsd,!race openbsd,!race
+// +build darwin,!race dragonfly,!race freebsd linux netbsd openbsd solaris
 
 package unix
 
diff --git a/unix/str.go b/unix/str.go
index 9dc86d15..f873edec 100644
--- a/unix/str.go
+++ b/unix/str.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 darwin dragonfly freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package unix
 
diff --git a/unix/syscall.go b/unix/syscall.go
index 7ba44756..0d63f641 100644
--- a/unix/syscall.go
+++ b/unix/syscall.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 darwin dragonfly freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 // Package unix contains an interface to the low-level operating system
 // primitives.  OS details vary depending on the underlying system, and
diff --git a/unix/syscall_test.go b/unix/syscall_test.go
index e5bab901..7306345c 100644
--- a/unix/syscall_test.go
+++ b/unix/syscall_test.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 darwin dragonfly freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package unix_test