diff --git a/lib/src/cache.dart b/lib/src/cache.dart
index 1bd3d6e..7c86544 100644
--- a/lib/src/cache.dart
+++ b/lib/src/cache.dart
@@ -49,7 +49,7 @@ class Cache {
   Map<CacheKey, List<DateTime>> get results => _results;
 
   void add(CacheKey key, List<DateTime> data) {
-    _results[key]= data;
+    _results[key] = data;
   }
 
   List<DateTime>? get(CacheKey key) {
diff --git a/lib/src/recurrence_rule.dart b/lib/src/recurrence_rule.dart
index 0896bfd..2fa0857 100644
--- a/lib/src/recurrence_rule.dart
+++ b/lib/src/recurrence_rule.dart
@@ -1,5 +1,4 @@
 import 'dart:collection';
-import 'dart:math';
 
 import 'package:collection/collection.dart';
 import 'package:meta/meta.dart';