diff --git a/Examples/Counter/Counter/Counter.swift b/Examples/Counter/Counter/Counter.swift
index e38762a..af99124 100644
--- a/Examples/Counter/Counter/Counter.swift
+++ b/Examples/Counter/Counter/Counter.swift
@@ -16,8 +16,8 @@ struct Counter: Dripper {
 
     // MARK: Nested Types
 
-    @MainActor
     @Observable
+    @MainActor
     final class State: Sendable {
         var counter: Int = .zero
         var text = ""
@@ -43,11 +43,6 @@ struct Counter: Dripper {
                 state.counter = .zero
             case .randomNumber:
                 return .run { pour in
-                    func randomNumber() async throws -> Int {
-                        try await Task.sleep(for: .seconds(1))
-                        return Int.random(in: 1...100)
-                    }
-
                     let randomNumber = try await randomNumber()
 
                     pour(.decreaseCounter)
@@ -58,6 +53,13 @@ struct Counter: Dripper {
             return .none
         }
     }
+
+    // MARK: Functions
+
+    private func randomNumber() async throws -> Int {
+        try await Task.sleep(for: .seconds(1))
+        return Int.random(in: 1...100)
+    }
 }
 
 import SwiftUI
diff --git a/Sources/Dripper/Effect.swift b/Sources/Dripper/Effect.swift
index b968919..e239202 100644
--- a/Sources/Dripper/Effect.swift
+++ b/Sources/Dripper/Effect.swift
@@ -50,8 +50,8 @@ extension Effect {
     // MARK: Static Functions
 
     public static func run(
-        blend: @escaping (_ pour: Pour<Action>) async throws -> Void,
-        catch errorHandler: ((_ error: any Error, _ pour: Pour<Action>) async -> Void)? = nil,
+        blend: @escaping @MainActor (_ pour: Pour<Action>) async throws -> Void,
+        catch errorHandler: (@MainActor (_ error: any Error, _ pour: Pour<Action>) async -> Void)? = nil,
         fileID: StaticString = #fileID,
         line: UInt = #line
     ) -> Self {