diff --git a/packages/svelte/src/internal/client/constants.js b/packages/svelte/src/internal/client/constants.js
index 724454a233..7d52e6abf1 100644
--- a/packages/svelte/src/internal/client/constants.js
+++ b/packages/svelte/src/internal/client/constants.js
@@ -15,8 +15,6 @@ export const DESTROYED = 1 << 15;
 export const EFFECT_RAN = 1 << 16;
 /** 'Transparent' effects do not create a transition boundary */
 export const EFFECT_TRANSPARENT = 1 << 17;
-/** Svelte 4 legacy mode props need to be handled with deriveds and be recognized elsewhere, hence the dedicated flag */
-export const LEGACY_DERIVED_PROP = 1 << 18;
 export const INSPECT_EFFECT = 1 << 19;
 export const HEAD_EFFECT = 1 << 20;
 export const EFFECT_IS_UPDATING = 1 << 21;