diff --git a/configure.ac b/configure.ac
index 2f6d7238..f5ae8571 100644
--- a/configure.ac
+++ b/configure.ac
@@ -281,8 +281,7 @@ AM_CONDITIONAL([USE_OSSFUZZ_STATIC], [test -f "$LIB_FUZZING_ENGINE"])
 AC_CHECK_HEADERS([errno.h fcntl.h stdio.h unistd.h sys/param.h sys/uio.h])
 AC_CHECK_HEADERS([sys/select.h sys/socket.h sys/ioctl.h sys/time.h])
 AC_CHECK_HEADERS([arpa/inet.h netinet/in.h])
-AC_CHECK_HEADERS([sys/un.h], [have_sys_un_h=yes], [have_sys_un_h=no])
-AM_CONDITIONAL([HAVE_SYS_UN_H], test "x$have_sys_un_h" = xyes)
+AC_CHECK_HEADERS([sys/un.h])
 
 case $host in
   *-*-cygwin* | *-*-cegcc*)