diff --git a/aidl_unittest.cpp b/aidl_unittest.cpp
index ddfa0a5..3dd4e62 100644
--- a/aidl_unittest.cpp
+++ b/aidl_unittest.cpp
@@ -2701,6 +2701,7 @@
 #include <binder/Parcel.h>
 #include <binder/Status.h>
 #include <cstdint>
+#include <type_traits>
 #include <utility>
 #include <variant>
 #include <vector>