diff --git a/ui/build/config.go b/ui/build/config.go
index 126a8d4..35dacf2 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -784,6 +784,10 @@
 	return shared.JoinPath(c.SoongOutDir(), ".bootstrap/build-globs."+name+".ninja")
 }
 
+func (c *configImpl) UsedEnvFile(tag string) string {
+	return shared.JoinPath(c.SoongOutDir(), usedEnvFile+"."+tag)
+}
+
 func (c *configImpl) MainNinjaFile() string {
 	return shared.JoinPath(c.SoongOutDir(), "build.ninja")
 }