diff --git a/libs/binder/IAppOpsService.cpp b/libs/binder/IAppOpsService.cpp
index b2bd9e5..e5f0a11 100644
--- a/libs/binder/IAppOpsService.cpp
+++ b/libs/binder/IAppOpsService.cpp
@@ -22,6 +22,8 @@
 #include <binder/Parcel.h>
 #include <utils/String8.h>
 
+#include <optional>
+
 namespace android {
 
 // ----------------------------------------------------------------------