diff --git a/mods/cool_tools.js b/mods/cool_tools.js
index 22691c13..80d4a335 100644
--- a/mods/cool_tools.js
+++ b/mods/cool_tools.js
@@ -12,7 +12,7 @@ elements.radiator = {
     color: "#248c1c",
     tool: function(pixel) {
         if (pixel.element == "null") {
-            pixel.element == "radiation"
+            pixel.element = "radiation"
         }
         if (pixel.element == "cloud") {
             pixel.element = "rad_cloud"