diff --git a/src/tests/att.t.cpp b/src/tests/att.t.cpp
index e811cbe3e..06810771c 100644
--- a/src/tests/att.t.cpp
+++ b/src/tests/att.t.cpp
@@ -27,6 +27,7 @@
 #include <Context.h>
 #include <Att.h>
 #include <test.h>
+#include <algorithm>
 
 Context context;