diff --git a/guesswidth.go b/guesswidth.go
index dfdc3f5..2c19cac 100644
--- a/guesswidth.go
+++ b/guesswidth.go
@@ -1,5 +1,4 @@
-//go:build appengine || (!linux && !freebsd && !darwin && !dragonfly && !netbsd && !openbsd)
-// +build appengine !linux,!freebsd,!darwin,!dragonfly,!netbsd,!openbsd
+//go:build tinygo || appengine || (!linux && !freebsd && !darwin && !dragonfly && !netbsd && !openbsd)
 
 package kong
 
diff --git a/guesswidth_unix.go b/guesswidth_unix.go
index 0170055..7fc5d02 100644
--- a/guesswidth_unix.go
+++ b/guesswidth_unix.go
@@ -1,5 +1,4 @@
-//go:build (!appengine && linux) || freebsd || darwin || dragonfly || netbsd || openbsd
-// +build !appengine,linux freebsd darwin dragonfly netbsd openbsd
+//go:build !tinygo && ((!appengine && linux) || freebsd || darwin || dragonfly || netbsd || openbsd)
 
 package kong