diff --git a/bures-monitor.lua b/bures-monitor.lua
index 9e0be63..5f229db 100644
--- a/bures-monitor.lua
+++ b/bures-monitor.lua
@@ -19,7 +19,7 @@ local function tFilter(table, func)
     local result = {}
     for key, value in pairs(table) do
         if func(value) then
-            result.insert(result, value)
+            result:insert(result, value)
         end
     end
     return result