diff --git a/lib/getdate.c.cvs b/lib/getdate.c.cvs
index 8607df3db..1e7d97727 100644
--- a/lib/getdate.c.cvs
+++ b/lib/getdate.c.cvs
@@ -47,11 +47,6 @@
 #define YYDEBUG 0
 #endif
 
-#ifndef YYSTACK_USE_ALLOCA
-  /* to satisfy gcc -Wundef, we set this to 0 */
-#define YYSTACK_USE_ALLOCA 0
-#endif
-
 /* Since the code of getdate.y is not included in the Emacs executable
    itself, there is no need to #define static in this file.  Even if
    the code were included in the Emacs executable, it probably