diff --git a/scripts/http-slowloris-check.nse b/scripts/http-slowloris-check.nse
index d8d57005b..2dd358936 100644
--- a/scripts/http-slowloris-check.nse
+++ b/scripts/http-slowloris-check.nse
@@ -53,7 +53,7 @@ Idea from Qualys blogpost:
 
 author = "Aleksandar Nikolic"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
-categories = {"vuln", "safe"}
+categories = {"vuln", "intrusive"}
 
 
 portrule = shortport.http