diff --git a/conncheck.go b/conncheck.go
index 70e9925f6..3dd115485 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 !windows,!appengine
+// +build linux darwin
 
 package mysql
 
diff --git a/conncheck_dummy.go b/conncheck_dummy.go
index 4888288aa..d042811c1 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 windows appengine
+// +build !linux,!darwin
 
 package mysql
 
diff --git a/conncheck_test.go b/conncheck_test.go
index b7234b0f5..8cd81223a 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 go1.10,!windows
+// +build linux darwin
 
 package mysql