diff --git a/include/openmc/particle_data.h b/include/openmc/particle_data.h
index 06ca5990a5..d3d00571a8 100644
--- a/include/openmc/particle_data.h
+++ b/include/openmc/particle_data.h
@@ -162,9 +162,6 @@ struct MacroXS {
   double fission;     //!< macroscopic fission xs
   double nu_fission;  //!< macroscopic production xs
   double photon_prod; //!< macroscopic photon production xs
-#ifdef NCRYSTAL
-  double NCrystal_XS;   //!< macroscopic cross section of processes handled by NCrystal
-#endif
 
   // Photon cross sections
   double coherent;        //!< macroscopic coherent xs