diff --git a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamAspectRatio.tsx b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamAspectRatio.tsx
index 05e0b09cee..bf2782b525 100644
--- a/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamAspectRatio.tsx
+++ b/invokeai/frontend/web/src/features/parameters/components/Parameters/Core/ParamAspectRatio.tsx
@@ -15,8 +15,6 @@ const aspectRatios = [
   { name: '1:1', value: 1 / 1 },
 ];
 
-export const mappedAspectRatios = aspectRatios.map((ar) => ar.value);
-
 export default function ParamAspectRatio() {
   const aspectRatio = useAppSelector(
     (state: RootState) => state.generation.aspectRatio
diff --git a/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts b/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts
index 9fd2c5aace..4ffd5ca565 100644
--- a/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts
+++ b/invokeai/frontend/web/src/features/parameters/store/generationSlice.ts
@@ -6,7 +6,6 @@ import { clamp } from 'lodash-es';
 import { ImageDTO } from 'services/api/types';
 
 import { flipBoundingBoxAxes } from 'features/canvas/store/canvasSlice';
-import { mappedAspectRatios } from '../components/Parameters/Core/ParamAspectRatio';
 import { clipSkipMap } from '../types/constants';
 import {
   CfgScaleParam,
@@ -154,7 +153,7 @@ export const generationSlice = createSlice({
     },
     toggleSize: (state) => {
       const [width, height] = [state.width, state.height];
-      if (!mappedAspectRatios.includes(height / width)) {
+      if (![null, 2 / 3, 16 / 9, 1 / 1].includes(height / width)) {
         state.aspectRatio = null;
       }
       state.width = height;
@@ -282,7 +281,7 @@ export const generationSlice = createSlice({
     setShouldLockAspectRatio: (state, action: PayloadAction<boolean>) => {
       if (
         action.payload === false &&
-        !mappedAspectRatios.includes(state.aspectRatio)
+        ![null, 2 / 3, 16 / 9, 1 / 1].includes(state.aspectRatio)
       ) {
         state.aspectRatio = null;
       }