diff --git a/src/ifcgeom/Serialization/schema/Serialization.cpp b/src/ifcgeom/Serialization/schema/Serialization.cpp
index 328747847d..6256d81008 100644
--- a/src/ifcgeom/Serialization/schema/Serialization.cpp
+++ b/src/ifcgeom/Serialization/schema/Serialization.cpp
@@ -32,6 +32,8 @@
 
 #include <numeric>
 
+#include <numeric>
+
 template <typename T, typename U>
 int convert_to_ifc(const T& t, U*& u, bool /*advanced*/) {
 	std::vector<double> coords(3);