diff --git a/tests/library/test/test-helper-demangling-test.cpp b/tests/library/test/test-helper-demangling-test.cpp
index c158d1cee..6bee8c2a3 100644
--- a/tests/library/test/test-helper-demangling-test.cpp
+++ b/tests/library/test/test-helper-demangling-test.cpp
@@ -25,6 +25,7 @@
 #include "lib/test/test-helper.hpp"
 
 #include <string>
+#include <iostream>
 
 using std::string;
 using std::cout;