diff --git a/acinclude.m4 b/acinclude.m4
index c6f52a0bd23..2c6f4b7dc85 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1460,29 +1460,6 @@ AC_DEFUN([PHP_SOCKADDR_CHECKS], [
   fi
 ])
 
-dnl
-dnl PHP_DECLARED_TIMEZONE
-dnl
-AC_DEFUN([PHP_DECLARED_TIMEZONE],[
-  AC_CACHE_CHECK(for declared timezone, ac_cv_declared_timezone,[
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-#include <sys/types.h>
-#include <time.h>
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
-]],[[
-    time_t foo = (time_t) timezone;
-]])],[
-  ac_cv_declared_timezone=yes
-],[
-  ac_cv_declared_timezone=no
-])])
-  if test "$ac_cv_declared_timezone" = "yes"; then
-    AC_DEFINE(HAVE_DECLARED_TIMEZONE, 1, [Whether system headers declare timezone])
-  fi
-])
-
 dnl
 dnl PHP_EBCDIC
 dnl
diff --git a/configure.ac b/configure.ac
index 6a5bc8bf5a5..89d302910cb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -734,7 +734,6 @@ fi
 
 AC_REPLACE_FUNCS(strlcat strlcpy explicit_bzero getopt)
 AC_FUNC_ALLOCA
-PHP_DECLARED_TIMEZONE
 PHP_TIME_R_TYPE
 PHP_READDIR_R_TYPE
 PHP_CHECK_IN_ADDR_T
diff --git a/main/php.h b/main/php.h
index 5ea9d511723..332005fa4c8 100644
--- a/main/php.h
+++ b/main/php.h
@@ -80,7 +80,6 @@
 /* Windows specific defines */
 #ifdef PHP_WIN32
 # define PHP_PROG_SENDMAIL		"Built in mailer"
-# define HAVE_DECLARED_TIMEZONE
 # define WIN32_LEAN_AND_MEAN
 # define NOOPENFILE