diff --git a/src/config.in b/src/config.in
index 898882a0f65..5c84d99c70c 100644
--- a/src/config.in
+++ b/src/config.in
@@ -135,7 +135,12 @@ Boston, MA 02111-1307, USA.  */
 #undef HAVE_ALLOCA_H
 
 #undef HAVE_GETTIMEOFDAY
+/* If we don't have gettimeofday,
+   the test for GETTIMEOFDAY_ONE_ARGUMENT may succeed,
+   but we should ignore it.  */
+#ifdef HAVE_GETTIMEOFDAY
 #undef GETTIMEOFDAY_ONE_ARGUMENT
+#endif
 #undef HAVE_GETHOSTNAME
 #undef HAVE_DUP2
 #undef HAVE_RENAME