diff --git a/m4/curl-confopts.m4 b/m4/curl-confopts.m4
index 2d4ab2955a..04b98b370b 100644
--- a/m4/curl-confopts.m4
+++ b/m4/curl-confopts.m4
@@ -421,10 +421,8 @@ dnl Check for how to set a socket into non-blocking state.
 
 AC_DEFUN([CURL_CHECK_NONBLOCKING_SOCKET], [
   AC_REQUIRE([CURL_CHECK_FUNC_FCNTL])dnl
-  AC_REQUIRE([CURL_CHECK_FUNC_IOCTL])dnl
   AC_REQUIRE([CURL_CHECK_FUNC_IOCTLSOCKET])dnl
   AC_REQUIRE([CURL_CHECK_FUNC_IOCTLSOCKET_CAMEL])dnl
-  AC_REQUIRE([CURL_CHECK_FUNC_SETSOCKOPT])dnl
   #
   tst_method="unknown"