diff --git a/src/UnitTest/test_local_cache.cpp b/src/UnitTest/test_local_cache.cpp
index 5fbc31b..6b8d52e 100644
--- a/src/UnitTest/test_local_cache.cpp
+++ b/src/UnitTest/test_local_cache.cpp
@@ -5,6 +5,7 @@
 #include <gtest/gtest.h>
 
 #undef NDEBUG // ensure that asserts are never compiled out
+#include <array>
 #include <cassert>
 #include <cstdio>
 #include <cstring>