diff --git a/src/libslic3r/SLA/EigenMesh3D.hpp b/src/libslic3r/SLA/EigenMesh3D.hpp
index a427dde3c..fd60c04ed 100644
--- a/src/libslic3r/SLA/EigenMesh3D.hpp
+++ b/src/libslic3r/SLA/EigenMesh3D.hpp
@@ -7,7 +7,7 @@
 // There is an implementation of a hole-aware raycaster that was eventually
 // not used in production version. It is now hidden under following define
 // for possible future use.
-//#define SLIC3R_HOLE_RAYCASTER
+#define SLIC3R_HOLE_RAYCASTER
 
 #ifdef SLIC3R_HOLE_RAYCASTER
   #include "libslic3r/SLA/Hollowing.hpp"