[Minor] Add namespace

diff --git a/src/libserver/css/css_tokeniser.cxx b/src/libserver/css/css_tokeniser.cxx
index e44c14011d637246bf75a37e3c9840f50000fa32..fe547d82cef4752d62cfb04c651f1aa86360dcf1 100644 (file)
--- a/src/libserver/css/css_tokeniser.cxx
+++ b/src/libserver/css/css_tokeniser.cxx
@@ -368,7 +368,7 @@ auto css_tokeniser::consume_number() -> struct css_parser_token
                auto num = g_ascii_strtod(numbuf, &endptr);
                offset = i;
 
-               if ((endptr && *endptr != '\0') || num >= G_MAXFLOAT || num <= G_MINFLOAT || isnan(num)) {
+               if ((endptr && *endptr != '\0') || num >= G_MAXFLOAT || num <= G_MINFLOAT || std::isnan(num)) {
                        msg_debug_css("invalid number: %s", numbuf);
                        return make_token<css_parser_token::token_type::delim_token>(input[i - 1]);
                }