diff --git a/lib/parsedate.c b/lib/parsedate.c
index 9eccbce1..e486715d 100644
--- a/lib/parsedate.c
+++ b/lib/parsedate.c
@@ -26,7 +26,9 @@
 
 
 
+#if !defined(HAVE_STRUCT_TM_TM_ZONE) && !defined(_TIMEZONE) && !defined(HAVE_DECLARED_TIMEZONE)
 extern time_t timezone;
+#endif
 
 #define yylhs		date_yylhs
 #define yylen		date_yylen