diff --git a/xs/src/libslic3r/SupportMaterial.cpp b/xs/src/libslic3r/SupportMaterial.cpp
index 62beb24f0..8927be236 100644
--- a/xs/src/libslic3r/SupportMaterial.cpp
+++ b/xs/src/libslic3r/SupportMaterial.cpp
@@ -1,3 +1,4 @@
+#ifndef SLIC3RXS
 #include "SupportMaterial.hpp"
 
 namespace Slic3r
@@ -1223,3 +1224,4 @@ SupportMaterial::create_circle(coordf_t radius)
 }
 
 }
+#endif // SLIC3RXS
diff --git a/xs/src/libslic3r/SupportMaterial.hpp b/xs/src/libslic3r/SupportMaterial.hpp
index 719b70586..3dc523abf 100644
--- a/xs/src/libslic3r/SupportMaterial.hpp
+++ b/xs/src/libslic3r/SupportMaterial.hpp
@@ -1,3 +1,4 @@
+#ifndef SLIC3RXS
 #ifndef slic3r_SupportMaterial_hpp_
 #define slic3r_SupportMaterial_hpp_
 
@@ -166,3 +167,5 @@ private:
 }
 
 #endif
+
+#endif // SLIC3RXS