diff --git a/tools/aidl/AST.h b/tools/aidl/AST.h
index 1dedd048bd14c..aec21644bf6b9 100755
--- a/tools/aidl/AST.h
+++ b/tools/aidl/AST.h
@@ -5,6 +5,7 @@
 #include <vector>
 #include <set>
 #include <stdarg.h>
+#include <stdio.h>
 
 using namespace std;