diff --git a/test/test_set_adaptors.cpp b/test/test_set_adaptors.cpp
index 5394b77b..5e89d73a 100644
--- a/test/test_set_adaptors.cpp
+++ b/test/test_set_adaptors.cpp
@@ -5,6 +5,7 @@
 
 #include <array>
 #include <utility>
+#include <vector>
 
 #include "test_utils.hpp"