diff --git a/test/src/optimization/NonlinearProblemTest.cpp b/test/src/optimization/NonlinearProblemTest.cpp
index 2df504f6..2b6c976a 100644
--- a/test/src/optimization/NonlinearProblemTest.cpp
+++ b/test/src/optimization/NonlinearProblemTest.cpp
@@ -1,7 +1,5 @@
 // Copyright (c) Sleipnir contributors
 
-#include <vector>
-
 #include <catch2/catch_approx.hpp>
 #include <catch2/catch_test_macros.hpp>
 #include <fmt/core.h>