diff --git a/invokeai/frontend/web/src/app/constants.ts b/invokeai/frontend/web/src/app/constants.ts
index c757c8959f..ae362ec85b 100644
--- a/invokeai/frontend/web/src/app/constants.ts
+++ b/invokeai/frontend/web/src/app/constants.ts
@@ -41,9 +41,9 @@ export const SCHEDULER_ITEMS = [
   'heun',
   'heun_k',
   'unipc',
-];
+] as const;
 
-export type Scheduler = typeof SCHEDULERS;
+export type Scheduler = (typeof SCHEDULER_ITEMS)[number];
 
 // Valid upscaling levels
 export const UPSCALING_LEVELS: Array<{ label: string; value: string }> = [
diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamScheduler.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamScheduler.tsx
index d749b33eea..50295b206e 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamScheduler.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamScheduler.tsx
@@ -1,4 +1,4 @@
-import { SCHEDULER_ITEMS } from 'app/constants';
+import { SCHEDULER_ITEMS, Scheduler } from 'app/constants';
 import { RootState } from 'app/store/store';
 import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
 import IAIMantineSelect from 'common/components/IAIMantineSelect';
@@ -25,12 +25,13 @@ const ParamScheduler = () => {
 
   useEffect(() => {
     if (selectedSchedulers.length === 0)
-      dispatch(setSelectedSchedulers(SCHEDULER_ITEMS));
+      dispatch(setSelectedSchedulers([...SCHEDULER_ITEMS]));
 
     const schedulerFound = activeSchedulers.find(
       (activeSchedulers) => activeSchedulers.label === scheduler
     );
-    if (!schedulerFound) dispatch(setScheduler(activeSchedulers[0].value));
+    if (!schedulerFound)
+      dispatch(setScheduler(activeSchedulers[0].value as Scheduler));
   }, [dispatch, selectedSchedulers, scheduler, activeSchedulers]);
 
   const handleChange = useCallback(
@@ -38,7 +39,7 @@ const ParamScheduler = () => {
       if (!v) {
         return;
       }
-      dispatch(setScheduler(v));
+      dispatch(setScheduler(v as Scheduler));
     },
     [dispatch]
   );
diff --git a/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts b/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts
index 5f13bf59ea..59801b8c46 100644
--- a/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts
+++ b/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts
@@ -1,5 +1,6 @@
 import type { PayloadAction } from '@reduxjs/toolkit';
 import { createSlice } from '@reduxjs/toolkit';
+import { Scheduler } from 'app/constants';
 import { configChanged } from 'features/system/store/configSlice';
 import { clamp, sortBy } from 'lodash-es';
 import { ImageDTO } from 'services/api';
@@ -132,7 +133,7 @@ export const generationSlice = createSlice({
     setWidth: (state, action: PayloadAction<number>) => {
       state.width = action.payload;
     },
-    setScheduler: (state, action: PayloadAction<string>) => {
+    setScheduler: (state, action: PayloadAction<Scheduler>) => {
       state.scheduler = action.payload;
     },
     setSeed: (state, action: PayloadAction<number>) => {
diff --git a/invokeai/frontend/web/src/features/parameters/store/parameterZodSchemas.ts b/invokeai/frontend/web/src/features/parameters/store/parameterZodSchemas.ts
index d17dcbce10..b865faf121 100644
--- a/invokeai/frontend/web/src/features/parameters/store/parameterZodSchemas.ts
+++ b/invokeai/frontend/web/src/features/parameters/store/parameterZodSchemas.ts
@@ -1,4 +1,4 @@
-import { NUMPY_RAND_MAX } from 'app/constants';
+import { NUMPY_RAND_MAX, SCHEDULER_ITEMS } from 'app/constants';
 import { z } from 'zod';
 
 /**
@@ -73,7 +73,7 @@ export const isValidCfgScale = (val: unknown): val is CfgScaleParam =>
 /**
  * Zod schema for scheduler parameter
  */
-export const zScheduler = z.string();
+export const zScheduler = z.enum(SCHEDULER_ITEMS);
 /**
  * Type alias for scheduler parameter, inferred from its zod schema
  */