diff --git a/packages/svelte/src/internal/client/constants.js b/packages/svelte/src/internal/client/constants.js
index d8d4f01bb1..520e38f0af 100644
--- a/packages/svelte/src/internal/client/constants.js
+++ b/packages/svelte/src/internal/client/constants.js
@@ -17,8 +17,8 @@ export const EFFECT_RAN = 1 << 15;
 export const EFFECT_TRANSPARENT = 1 << 16;
 export const INSPECT_EFFECT = 1 << 17;
 export const HEAD_EFFECT = 1 << 18;
-export const EFFECT_IS_UPDATING = 1 << 19;
-export const EFFECT_PRESERVED = 1 << 20; // effects with this flag should not be pruned
+export const EFFECT_PRESERVED = 1 << 19;
+export const EFFECT_IS_UPDATING = 1 << 20;
 
 // Flags used for async
 export const REACTION_IS_UPDATING = 1 << 21;