diff --git a/data/mods/Graphical_Overmap/overmap_terrain.json b/data/mods/Graphical_Overmap/overmap_terrain.json
index 58cca4da5b523..9ef1753c1c0eb 100644
--- a/data/mods/Graphical_Overmap/overmap_terrain.json
+++ b/data/mods/Graphical_Overmap/overmap_terrain.json
@@ -650,7 +650,7 @@
     "id": "irradiator_1_8",
     "copy-from": "irradiator_1_8",
     "sym": "Ö",
-    "color": "green"
+    "color": "light_green"
   },
   {
     "type": "overmap_terrain",
@@ -713,7 +713,7 @@
     "id": "irradiator_1_8_roof",
     "copy-from": "irradiator_1_8_roof",
     "sym": "Ö",
-    "color": "green"
+    "color": "light_green"
   },
   {
     "type": "overmap_terrain",