diff --git a/kubejs/startup_scripts/gtceu/materials.js b/kubejs/startup_scripts/gtceu/materials.js
index 092cf24af..1f676ed01 100644
--- a/kubejs/startup_scripts/gtceu/materials.js
+++ b/kubejs/startup_scripts/gtceu/materials.js
@@ -289,6 +289,7 @@ const registerGTCEuMaterialModification = (event) => {
 	GTMaterials.Cobaltite.setProperty(PropertyKey.HAZARD, new $HAZARD_PROPERTY($HAZARD_PROPERTY.HazardTrigger.INHALATION, GTMedicalConditions.ARSENICOSIS, 1, false));
 	GTMaterials.Galena.setProperty(PropertyKey.HAZARD, new $HAZARD_PROPERTY($HAZARD_PROPERTY.HazardTrigger.INHALATION, GTMedicalConditions.WEAK_POISON, 1, false));
 	GTMaterials.Chromite.setProperty(PropertyKey.HAZARD, new $HAZARD_PROPERTY($HAZARD_PROPERTY.HazardTrigger.SKIN_CONTACT, GTMedicalConditions.IRRITANT, 1, false));
+	GTMaterials.Thorium.setProperty(PropertyKey.HAZARD, new $HAZARD_PROPERTY($HAZARD_PROPERTY.HazardTrigger.ANY, GTMedicalConditions.CARCINOGEN, 1, true));
 
 	// Make these the lowest tier of EBF instead
 	GTMaterials.BlackSteel.getProperty(PropertyKey.BLAST).setBlastTemperature(1000)