diff --git a/android/variable.go b/android/variable.go
index 4e1df3c..81999f3 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -713,6 +713,8 @@
 	ProductFsCasefold    string `json:",omitempty"`
 	ProductQuotaProjid   string `json:",omitempty"`
 	ProductFsCompression string `json:",omitempty"`
+
+	ReleaseToolsExtensionDir string `json:",omitempty"`
 }
 
 func boolPtr(v bool) *bool {