diff --git a/src/features/tooltips/tooltip.ts b/src/features/tooltips/tooltip.ts
index 129bd16..b5b1042 100644
--- a/src/features/tooltips/tooltip.ts
+++ b/src/features/tooltips/tooltip.ts
@@ -52,7 +52,7 @@ export interface BaseTooltip {
 export type Tooltip<T extends TooltipOptions> = Replace<
     T & BaseTooltip,
     {
-        pinnable: T["pinnable"] extends undefined ? false : T["pinnable"];
+        pinnable: undefined extends T["pinnable"] ? false : T["pinnable"];
         pinned: T["pinnable"] extends true ? Ref<boolean> : undefined;
         display: GetComputableType<T["display"]>;
         classes: GetComputableType<T["classes"]>;
diff --git a/src/game/modifiers.tsx b/src/game/modifiers.tsx
index cceacd8..b65e7fc 100644
--- a/src/game/modifiers.tsx
+++ b/src/game/modifiers.tsx
@@ -41,11 +41,11 @@ export interface Modifier {
 /**
  * Utility type used to narrow down a modifier type that will have a description and/or enabled property based on optional parameters, T and S (respectively).
  */
-export type ModifierFromOptionalParams<T, S> = T extends undefined
-    ? S extends undefined
+export type ModifierFromOptionalParams<T, S> = undefined extends T
+    ? undefined extends S
         ? Omit<WithRequired<Modifier, "invert" | "getFormula">, "description" | "enabled">
         : Omit<WithRequired<Modifier, "invert" | "enabled" | "getFormula">, "description">
-    : S extends undefined
+    : undefined extends S
     ? Omit<WithRequired<Modifier, "invert" | "description" | "getFormula">, "enabled">
     : WithRequired<Modifier, "invert" | "enabled" | "description" | "getFormula">;