diff --git a/httpd/httpd.c b/httpd/httpd.c
index 6649b36..38f2ec1 100644
--- a/httpd/httpd.c
+++ b/httpd/httpd.c
@@ -630,7 +630,7 @@ void httpd_appcall(void)
 
 			slen = strtox(outbuf, "HTTP/1.1 200 OK\r\nContent-Type: ");
 			slen += strtox(outbuf + slen, mime_strings[f_data[entry].mime]);
-			slen += strtox(outbuf + slen, "; charset=UTF-8\r\nCache-Control: max-age=60, must-revalidate\r\nAccess-Control-Allow-Origin: *\r\n\r\n");
+			slen += strtox(outbuf + slen, "; charset=UTF-8\r\nCache-Control: max-age=60, must-revalidate\r\nAccess-Control-Allow-Origin: *\r\nContent-Security-Policy: style-src 'self' 'unsafe-inline'\r\n\r\n");
 
 			len_left = f_data[entry].len;
 			if (len_left > (TCP_OUTBUF_SIZE - slen)) {