diff --git a/test/test_unordered_set.cpp b/test/test_unordered_set.cpp
index 854200d0..1436c177 100644
--- a/test/test_unordered_set.cpp
+++ b/test/test_unordered_set.cpp
@@ -28,7 +28,6 @@ SOFTWARE.
 
 #include <UnitTest++/UnitTest++.h>
 
-#include <set>
 #include <array>
 #include <algorithm>
 #include <utility>