diff --git a/NumLib/Function/LinearInterpolationOnSurface.cpp b/NumLib/Function/LinearInterpolationOnSurface.cpp
index 8af06bb38ee6cecc43fd7921a1641b278dd8a7fd..d71716a7b856ac5400e1ea1ccacd5f5b105e328d 100644
--- a/NumLib/Function/LinearInterpolationOnSurface.cpp
+++ b/NumLib/Function/LinearInterpolationOnSurface.cpp
@@ -15,6 +15,7 @@
 #include <limits>
 #include <array>
 #include <cassert>
+#include <numeric>
 
 #include "MathLib/Vector3.h"
 #include "GeoLib/Surface.h"