diff --git a/m4/ax_python_devel.m4 b/m4/ax_python_devel.m4
index 35f025f2a568772c572f6f1c217c37b05e88f322..0451cd46b74d03986663483f7b2993b273386847 100644
--- a/m4/ax_python_devel.m4
+++ b/m4/ax_python_devel.m4
@@ -67,7 +67,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 26
+#serial 33
 
 AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
 AC_DEFUN([AX_PYTHON_DEVEL],[
@@ -125,7 +125,7 @@ class VPy:
         return tuple(map(int, s.strip().replace("rc", ".").split(".")))
     def __init__(self):
         import sys
-        self.vpy = tuple(sys.version_info)
+        self.vpy = tuple(sys.version_info)[[:3]]
     def __eq__(self, s):
         return self.vpy == self.vtup(s)
     def __ne__(self, s):