diff --git a/include/llmr/geometry/vertex_buffer.hpp b/include/llmr/geometry/vertex_buffer.hpp
index a9236992c..9478d7b15 100644
--- a/include/llmr/geometry/vertex_buffer.hpp
+++ b/include/llmr/geometry/vertex_buffer.hpp
@@ -2,6 +2,7 @@
 #define LLMR_GEOMETRY_VERTEX_BUFFER
 
 #include <vector>
+#include <cstddef>
 #include <cstdint>
 #include <cmath>