diff --git a/packages/api/src/base/Init.ts b/packages/api/src/base/Init.ts
index 4fa2dfacea..544a6e2da9 100644
--- a/packages/api/src/base/Init.ts
+++ b/packages/api/src/base/Init.ts
@@ -29,8 +29,7 @@ function textToString (t: Text): string {
 }
 
 export abstract class Init<ApiType extends ApiTypes> extends Decorate<ApiType> {
-  // Browser/Deno = number, Node = Timeout
-  #healthTimer: unknown | null = null;
+  #healthTimer: ReturnType<typeof setInterval> | null = null;
 
   #registries: VersionedRegistry<ApiType>[] = [];
 
@@ -374,8 +373,7 @@ export abstract class Init<ApiType extends ApiTypes> extends Decorate<ApiType> {
 
   private _unsubscribeHealth (): void {
     if (this.#healthTimer) {
-      // different method signatures for Node vs Browser/Deno
-      clearInterval(this.#healthTimer as number);
+      clearInterval(this.#healthTimer);
       this.#healthTimer = null;
     }
   }
diff --git a/packages/rpc-provider/src/mock/index.ts b/packages/rpc-provider/src/mock/index.ts
index d6b6e0b0e7..6138138248 100644
--- a/packages/rpc-provider/src/mock/index.ts
+++ b/packages/rpc-provider/src/mock/index.ts
@@ -44,8 +44,7 @@ export class MockProvider implements ProviderInterface {
 
   private emitter = new EventEmitter();
 
-  // Browser/Deno = number, Node = Timeout
-  private intervalId?: unknown | null;
+  private intervalId?: ReturnType<typeof setInterval> | null;
 
   public isUpdating = true;
 
@@ -110,8 +109,7 @@ export class MockProvider implements ProviderInterface {
   // eslint-disable-next-line @typescript-eslint/require-await
   public async disconnect (): Promise<void> {
     if (this.intervalId) {
-      // different method signatures for Node vs Browser/Deno
-      clearInterval(this.intervalId as number);
+      clearInterval(this.intervalId);
       this.intervalId = null;
     }
   }
diff --git a/packages/rpc-provider/src/ws/index.ts b/packages/rpc-provider/src/ws/index.ts
index 805a764b6c..c2e4e95484 100644
--- a/packages/rpc-provider/src/ws/index.ts
+++ b/packages/rpc-provider/src/ws/index.ts
@@ -106,8 +106,7 @@ export class WsProvider implements ProviderInterface {
 
   #subscriptions: Record<string, WsStateSubscription> = {};
 
-  // Browser/Deno = number, Node = Timeout
-  #timeoutId?: unknown | null = null;
+  #timeoutId?: ReturnType<typeof setInterval> | null = null;
 
   #websocket: WebSocket | null;
 
@@ -431,8 +430,7 @@ export class WsProvider implements ProviderInterface {
     }
 
     if (this.#timeoutId) {
-      // different method signatures for Node vs Browser/Deno
-      clearInterval(this.#timeoutId as number);
+      clearInterval(this.#timeoutId);
       this.#timeoutId = null;
     }