diff --git a/colorable_appengine.go b/colorable_appengine.go
index 1f7806f..416d1bb 100644
--- a/colorable_appengine.go
+++ b/colorable_appengine.go
@@ -1,3 +1,4 @@
+//go:build appengine
 // +build appengine
 
 package colorable
diff --git a/colorable_others.go b/colorable_others.go
index 08cbd1e..766d946 100644
--- a/colorable_others.go
+++ b/colorable_others.go
@@ -1,5 +1,5 @@
-// +build !windows
-// +build !appengine
+//go:build !windows && !appengine
+// +build !windows,!appengine
 
 package colorable
 
diff --git a/colorable_windows.go b/colorable_windows.go
index 41215d7..e7a0715 100644
--- a/colorable_windows.go
+++ b/colorable_windows.go
@@ -1,5 +1,5 @@
-// +build windows
-// +build !appengine
+//go:build windows && !appengine
+// +build windows,!appengine
 
 package colorable