diff --git a/MeshLib/Location.h b/MeshLib/Location.h
index e874b2d57bf143f7da2763d61135b29d8f8a655d..c392ae1f064c6a61dff12e0f58726138ceaf66c0 100644
--- a/MeshLib/Location.h
+++ b/MeshLib/Location.h
@@ -10,6 +10,7 @@
  *
  */
 
+#include <cstddef>
 #include <iosfwd>
 
 #ifndef LOCATION_H_