diff --git a/tests/libslic3r/test_voronoi.cpp b/tests/libslic3r/test_voronoi.cpp
index 42d4a14bb1..ba318e4fd6 100644
--- a/tests/libslic3r/test_voronoi.cpp
+++ b/tests/libslic3r/test_voronoi.cpp
@@ -8,6 +8,8 @@
 
 #include <libslic3r/VoronoiOffset.hpp>
 
+#include <numeric>
+
 // #define VORONOI_DEBUG_OUT
 
 #ifdef VORONOI_DEBUG_OUT