diff --git a/src/P3957/P3957.cpp b/src/P3957/P3957.cpp
index 128cc9e..5770275 100644
--- a/src/P3957/P3957.cpp
+++ b/src/P3957/P3957.cpp
@@ -2,7 +2,6 @@
 #include <iostream>
 #include <algorithm>
 #include <limits>
-#include <type_traits>
 
 using ll = long long;