diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index aab24cf..8d7c3d0 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -103,12 +103,10 @@
 #include "Python.h"
 
 #ifdef __osf__
-#define _XOPEN_SOURCE_EXTENDED  /* Define macro for OSF/1 */
 #define STRICT_SYSV_CURSES      /* Don't use ncurses extensions */
 #endif
 
 #ifdef __hpux
-#define _XOPEN_SOURCE_EXTENDED
 #define STRICT_SYSV_CURSES
 #endif