diff --git a/android/config.go b/android/config.go
index f907de6..b7b4b02 100644
--- a/android/config.go
+++ b/android/config.go
@@ -33,7 +33,8 @@
 
 var Bool = proptools.Bool
 var String = proptools.String
-var FutureApiLevel = 10000
+
+const FutureApiLevel = 10000
 
 // The configuration file name
 const configFileName = "soong.config"