diff --git a/src/nucsyn/nucsyn_remove_mass_from_surface.c b/src/nucsyn/nucsyn_remove_mass_from_surface.c
index 1d61c9312d75934301c2c472175515c92dcdd300..b45f2b55a537fb489fc7668b13119ff3fa8f647d 100644
--- a/src/nucsyn/nucsyn_remove_mass_from_surface.c
+++ b/src/nucsyn/nucsyn_remove_mass_from_surface.c
@@ -1,5 +1,7 @@
 #include "../binary_c.h"
 
+#ifdef NUCSYN
+
 void nucsyn_remove_mass_from_surface(
 #if defined DEBUG && DEBUG > 0
     struct stardata_t * stardata,
@@ -35,3 +37,5 @@ void nucsyn_remove_mass_from_surface(
         *allocated = FALSE;
     }
 }
+
+#endif //NUCSYN