diff --git a/ares/m4/cares-functions.m4 b/ares/m4/cares-functions.m4
index 72d878449..f84778838 100644
--- a/ares/m4/cares-functions.m4
+++ b/ares/m4/cares-functions.m4
@@ -16,7 +16,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 37
+# serial 39
 
 
 dnl CARES_INCLUDES_ARPA_INET
@@ -1062,9 +1062,9 @@ AC_DEFUN([CARES_CHECK_FUNC_GETADDRINFO], [
     esac
     if test "$tst_tsafe_getaddrinfo" = "unknown"; then
       CURL_CHECK_DEF_CC([h_errno], [
-        $curl_includes_ws2tcpip
-        $curl_includes_sys_socket
-        $curl_includes_netdb
+        $cares_includes_ws2tcpip
+        $cares_includes_sys_socket
+        $cares_includes_netdb
         ], [silent])
       if test "$curl_cv_have_def_h_errno" = "no"; then
         tst_tsafe_getaddrinfo="no"