diff --git a/nselib/http.lua b/nselib/http.lua
index 6c51b6ccf..df89c0e9a 100644
--- a/nselib/http.lua
+++ b/nselib/http.lua
@@ -736,7 +736,7 @@ local function parse_set_cookie(s)
       else
         value = true
       end
-      cookie[name] = value
+      cookie[name:lower()] = value
       pos = skip_space(s, pos)
     end