diff --git a/cpp/tests/test_defaults.cpp b/cpp/tests/test_defaults.cpp
index 34443f94cf..ad7d0d17ce 100644
--- a/cpp/tests/test_defaults.cpp
+++ b/cpp/tests/test_defaults.cpp
@@ -15,7 +15,6 @@
  */
 
 #include <stdexcept>
-#include <unordered_map>
 
 #include <gtest/gtest.h>
 #include <kvikio/defaults.hpp>