diff --git a/cc/compiler.go b/cc/compiler.go
index aee584d..9187b9b 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -147,6 +147,9 @@
 		// list of aidl_interface sources
 		Sources []string `blueprint:"mutated"`
 
+		// root directory of AIDL sources
+		AidlRoot string `blueprint:"mutated"`
+
 		// AIDL backend language (e.g. "cpp", "ndk")
 		Lang string `blueprint:"mutated"`