diff --git a/module/config.mjs b/module/config.mjs
index 56a0fb4..d1fa118 100644
--- a/module/config.mjs
+++ b/module/config.mjs
@@ -68,6 +68,11 @@ export const itemFilters = [
 	`service`,
 ];
 
+export const invalidActiveEffectTargets = new Set([
+	`system.uses_inventory_slot`,
+	`system.quantity_affects_used_capacity`,
+]);
+
 export default {
 	stats,
 	statDice,
@@ -86,4 +91,5 @@ export default {
 	syncDice,
 	localizerConfig,
 	itemFilters,
+	invalidActiveEffectTargets,
 };
diff --git a/module/documents/ActiveEffect/GenericActiveEffect.mjs b/module/documents/ActiveEffect/GenericActiveEffect.mjs
index 7b3a036..47f10d3 100644
--- a/module/documents/ActiveEffect/GenericActiveEffect.mjs
+++ b/module/documents/ActiveEffect/GenericActiveEffect.mjs
@@ -1,3 +1,5 @@
+import { invalidActiveEffectTargets } from "../../config.mjs";
+
 export class DotDungeonActiveEffect extends ActiveEffect {
 
 	// Invert the logic of the disabled property so it's easier to modify via
@@ -6,6 +8,8 @@ export class DotDungeonActiveEffect extends ActiveEffect {
 	set enabled(newValue) { this.disabled = !newValue };
 
 	apply(object, change) {
+		if (invalidActiveEffectTargets.has(change.key)) return;
+
 		change.value = change.value.replace(
 			/@(?<key>[\w\.]+)/gi,
 			(...args) => {