diff --git a/ui/build/config.go b/ui/build/config.go
index c4bbad7..e567e40 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -804,6 +804,15 @@
 	return true
 }
 
+func (c *configImpl) RBEStatsOutputDir() string {
+	for _, f := range []string{"RBE_output_dir", "FLAG_output_dir"} {
+		if v, ok := c.environ.Get(f); ok {
+			return v
+		}
+	}
+	return ""
+}
+
 func (c *configImpl) UseRemoteBuild() bool {
 	return c.UseGoma() || c.UseRBE()
 }