diff --git a/test/engine/engine_core_smooth_test.cc b/test/engine/engine_core_smooth_test.cc
index 59e4ca3e..87897f7c 100644
--- a/test/engine/engine_core_smooth_test.cc
+++ b/test/engine/engine_core_smooth_test.cc
@@ -18,7 +18,6 @@
 #include "src/engine/engine_util_misc.h"
 #include "src/engine/engine_util_sparse.h"
 
-#include <algorithm>
 #include <string>
 #include <string_view>
 #include <vector>