--- a/setup.py
+++ b/setup.py
@@ -144,7 +144,7 @@ class pivy_build(build):
     SWIG = ((sys.platform == "win32" and "swig.exe") or "swig")
 
     SWIG_SUPPRESS_WARNINGS = "-w302,306,307,312,314,325,361,362,467,389,503,509,510"
-    SWIG_PARAMS = "-c++ -python -includeall -modern -D__PIVY__ " + \
+    SWIG_PARAMS = "-c++ -python -includeall -D__PIVY__ " + \
                   "-I. -Ifake_headers -I\"%s\" %s -o %s_wrap.cpp " + \
                   "interfaces" + os.sep + "%s.i"
     if sys.version_info.major >= 3:
--- a/interfaces/coin.i
+++ b/interfaces/coin.i
@@ -38,6 +38,7 @@ applications."
 
 #undef ANY
 
+#include <cstddef>
 #include "coin_header_includes.h"
 
 /* make GLState in SoGLLazyElement known to SWIG */
@@ -106,4 +107,4 @@ for x in list(locals()):
   except NameError:
     # value == SoSearchAction_duringSearchAll ???
     pass
-%}
\ No newline at end of file
+%}