diff --git a/packages/tools/mobx.ts b/packages/tools/mobx.ts
index c4c2b90..a24bc94 100644
--- a/packages/tools/mobx.ts
+++ b/packages/tools/mobx.ts
@@ -1,6 +1,6 @@
 import type { IReactionDisposer, IReactionOptions, IReactionPublic } from 'mobx';
 import { autorun, reaction } from 'mobx';
-import { debounce, omit } from 'radash';
+import { debounce } from 'radash';
 
 export function disposableReaction<T, FireImmediately extends boolean = false>(
   mustBeDisposed: () => boolean,
@@ -14,10 +14,6 @@ export function disposableReaction<T, FireImmediately extends boolean = false>(
 ) {
   let disposer: IReactionDisposer | undefined;
 
-  if (!mustBeDisposed()) {
-    disposer = reaction(expression, effect, reactionOpts);
-  }
-
   function cleanDisposer() {
     disposer = undefined;
   }
@@ -27,8 +23,7 @@ export function disposableReaction<T, FireImmediately extends boolean = false>(
       if (disposer !== undefined) disposer();
       cleanDisposer();
     } else {
-      const opts = reactionOpts ? omit(reactionOpts, ['fireImmediately']) : undefined;
-      disposer = reaction(expression, effect, opts);
+      disposer = reaction(expression, effect, reactionOpts);
     }
   });
 }