diff --git a/Source/SwiftLintFramework/Rules/Idiomatic/ToggleBoolRule.swift b/Source/SwiftLintFramework/Rules/Idiomatic/ToggleBoolRule.swift
index 1a89fa50a..73010f00c 100644
--- a/Source/SwiftLintFramework/Rules/Idiomatic/ToggleBoolRule.swift
+++ b/Source/SwiftLintFramework/Rules/Idiomatic/ToggleBoolRule.swift
@@ -1,3 +1,4 @@
+import Foundation
 import SourceKittenFramework
 
 public struct ToggleBoolRule: SubstitutionCorrectableRule, ConfigurationProviderRule, OptInRule, AutomaticTestableRule {