diff --git a/media/audioaidlconversion/AidlConversionCppNdk.cpp b/media/audioaidlconversion/AidlConversionCppNdk.cpp
index 46bb6f1..8c2b940 100644
--- a/media/audioaidlconversion/AidlConversionCppNdk.cpp
+++ b/media/audioaidlconversion/AidlConversionCppNdk.cpp
@@ -43,6 +43,9 @@
 
 using ::android::BAD_VALUE;
 using ::android::OK;
+using ::android::String16;
+using ::android::String8;
+using ::android::status_t;
 using ::android::base::unexpected;
 
 using media::audio::common::AudioChannelLayout;