diff --git a/vendor/bat-native-ads/src/bat/ads/internal/ml/transformation/hash_vectorizer.cc b/vendor/bat-native-ads/src/bat/ads/internal/ml/transformation/hash_vectorizer.cc
index 7933b7d988..1a9498dd43 100644
--- a/brave/vendor/bat-native-ads/src/bat/ads/internal/ml/transformation/hash_vectorizer.cc
+++ b/brave/vendor/bat-native-ads/src/bat/ads/internal/ml/transformation/hash_vectorizer.cc
@@ -5,6 +5,8 @@
 
 #include "bat/ads/internal/ml/transformation/hash_vectorizer.h"
 
+#include <cstring>
+
 #include "third_party/zlib/zlib.h"