diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 8ca7383327..d450165c7b 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -303,7 +303,7 @@ export function update_reaction(reaction) {
 	}
 
 	if (reaction.ac !== null) {
-		reaction.ac?.abort(STALE_REACTION);
+		reaction.ac.abort(STALE_REACTION);
 		reaction.ac = null;
 	}