diff --git a/tools/swig/lammps.i b/tools/swig/lammps.i
index 64f120bfb4..b7414573ba 100644
--- a/tools/swig/lammps.i
+++ b/tools/swig/lammps.i
@@ -18,7 +18,9 @@
 %pointer_cast(void *, double *,  void_p_to_double_p);
 %pointer_cast(void *, double **, void_p_to_double_2d_p);
 
+#if !defined(SWIGLUA)
 %cstring_output_maxsize(char *buffer, int buf_size);
+#endif
 
 %{