diff --git a/src/renderer/src/store/assistants.ts b/src/renderer/src/store/assistants.ts
index 6fe2832531..4db73a9547 100644
--- a/src/renderer/src/store/assistants.ts
+++ b/src/renderer/src/store/assistants.ts
@@ -202,11 +202,10 @@ const assistantsSlice = createSlice({
     },
     updateAssistantPreset: (state, action: PayloadAction<AssistantPreset>) => {
       const preset = action.payload
-      state.presets.forEach((a) => {
-        if (a.id === preset.id) {
-          a = preset
-        }
-      })
+      const index = state.presets.findIndex((a) => a.id === preset.id)
+      if (index !== -1) {
+        state.presets[index] = preset
+      }
     },
     updateAssistantPresetSettings: (
       state,