diff --git a/conncheck.go b/conncheck.go
index 3dd115485..024eb2858 100644
--- a/conncheck.go
+++ b/conncheck.go
@@ -6,7 +6,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at http://mozilla.org/MPL/2.0/.
 
-// +build linux darwin
+// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos
 
 package mysql
 
diff --git a/conncheck_dummy.go b/conncheck_dummy.go
index d042811c1..ea7fb607a 100644
--- a/conncheck_dummy.go
+++ b/conncheck_dummy.go
@@ -6,7 +6,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at http://mozilla.org/MPL/2.0/.
 
-// +build !linux,!darwin
+// +build !linux,!darwin,!dragonfly,!freebsd,!netbsd,!openbsd,!solaris,!illumos
 
 package mysql
 
diff --git a/conncheck_test.go b/conncheck_test.go
index 8cd81223a..53995517b 100644
--- a/conncheck_test.go
+++ b/conncheck_test.go
@@ -6,7 +6,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at http://mozilla.org/MPL/2.0/.
 
-// +build linux darwin
+// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos
 
 package mysql