diff --git a/matrix/httpclient/chttp.lua b/matrix/httpclient/chttp.lua
index 0f01ac9..31d2a6c 100644
--- a/matrix/httpclient/chttp.lua
+++ b/matrix/httpclient/chttp.lua
@@ -23,7 +23,7 @@ end
 
 local function headers_to_dict(h)
    local headers = {}
-   for name, value in pairs(h) do
+   for name, value in h:each() do
       if name:sub(1, 1) ~= ":" then
          headers[name] = value
       end