diff --git a/src/pl/plpython/plpython.h b/src/pl/plpython/plpython.h
index 3a1f0d56d..6a8a09a20 100644
--- a/src/pl/plpython/plpython.h	
+++ b/src/pl/plpython/plpython.h
@@ -45,12 +45,10 @@
 #if defined(_MSC_VER) && defined(_DEBUG)
 /* Python uses #pragma to bring in a non-default libpython on VC++ if
  * _DEBUG is defined */
-#undef _DEBUG
 /* Also hide away errcode, since we load Python.h before postgres.h */
 #define errcode __msvc_errcode
 #include <Python.h>
 #undef errcode
-#define _DEBUG
 #elif defined (_MSC_VER)
 #define errcode __msvc_errcode
 #include <Python.h>