diff --git a/DDTest/src/test_Evaluator.cc b/DDTest/src/test_Evaluator.cc
index 58103f4bf331053a1dd54ffd3e209aa42d680178..c8d01a2ad20d97289de1e91a689697fe82a01e32 100644
--- a/DDTest/src/test_Evaluator.cc
+++ b/DDTest/src/test_Evaluator.cc
@@ -3,6 +3,7 @@
 #include <iostream>
 #include <assert.h>
 #include <cmath>
+#include <array>
 
 #include <atomic>
 #include <thread>