diff --git a/watch_unsupported.go b/watch_unsupported.go
index dbf74ef37..7e2715377 100644
--- a/watch_unsupported.go
+++ b/watch_unsupported.go
@@ -1,5 +1,5 @@
-//go:build !darwin && !dragonfly && !freebsd && !openbsd && !linux && !netbsd && !solaris && !windows
-// +build !darwin,!dragonfly,!freebsd,!openbsd,!linux,!netbsd,!solaris,!windows
+//go:build appengine || (!darwin && !dragonfly && !freebsd && !openbsd && !linux && !netbsd && !solaris && !windows)
+// +build appengine !darwin,!dragonfly,!freebsd,!openbsd,!linux,!netbsd,!solaris,!windows
 
 package viper