diff --git a/src/document/html/parser/parse.c b/src/document/html/parser/parse.c
index 7a080b915..9265f7f29 100644
--- a/src/document/html/parser/parse.c
+++ b/src/document/html/parser/parse.c
@@ -1143,7 +1143,7 @@ xsp:
 int
 supports_html_media_attr(const unsigned char *media)
 {
-	const unsigned char *const optstr = get_opt_str("document.css.media", NULL);
+	const unsigned char *optstr;
 	const unsigned char *beg, *end;
 
 	/* The 1999-12-24 edition of HTML 4.01 is inconsistent on what
@@ -1172,6 +1172,8 @@ supports_html_media_attr(const unsigned char *media)
 	if (media == NULL || *media == '\0')
 		return 1;
 
+	optstr = get_opt_str("document.css.media", NULL);
+
 	while (*media != '\0') {
 		while (*media == ' ')
 			++media;