diff --git a/acconfig.h b/acconfig.h
index 8b37b5b8db..5b59f2e9f8 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -17,9 +17,6 @@
  ***/
 @TOP@
 
-/** define if tzset() is available */
-#undef HAVE_TZSET
-
 /**
  * define if pthread_setconcurrency() should be called to tell the
  * OS how many threads we might want to run.
diff --git a/config.h.in b/config.h.in
index d4673ead18..546c17727e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -17,9 +17,6 @@
  *** it does not get installed.
  ***/
 
-/** define if tzset() is available */
-#undef HAVE_TZSET
-
 /**
  * define if pthread_setconcurrency() should be called to tell the
  * OS how many threads we might want to run.