diff --git a/xcode/.swiftlint.yml b/xcode/.swiftlint.yml
index b535f1e..bfd2f73 100644
--- a/xcode/.swiftlint.yml
+++ b/xcode/.swiftlint.yml
@@ -245,6 +245,12 @@ custom_rules:
     message: "Using a type annotation for Bool is redundant"
     severity: error
 
+  redundant_type_annotation_string:
+    name: "Redundant type annotation for Bool"
+    regex: '((var|let)) *\w+ *((: *Bool *=)|([^=]*= *BehaviourRelay<Bool>\(\s*value\s*:)) *((true)|(false))'
+    message: "Using a type annotation for Bool is redundant"
+    severity: error
+
   # Rx
 
   unused_map_parameter: