diff --git a/nano/core_test/utility.cpp b/nano/core_test/utility.cpp
index a14475faf..bdd68e54e 100644
--- a/nano/core_test/utility.cpp
+++ b/nano/core_test/utility.cpp
@@ -9,6 +9,7 @@
 
 #include <boost/filesystem.hpp>
 
+#include <fstream>
 #include <future>
 
 using namespace std::chrono_literals;
@@ -325,4 +326,4 @@ TEST (relaxed_atomic_integral, many_threads)
 
 	// Check values
 	ASSERT_EQ (0, atomic);
-}
\ No newline at end of file
+}