diff --git a/Flow.Launcher.Infrastructure/PinyinAlphabet.cs b/Flow.Launcher.Infrastructure/PinyinAlphabet.cs
index 7f7f2da60..29b20a021 100644
--- a/Flow.Launcher.Infrastructure/PinyinAlphabet.cs
+++ b/Flow.Launcher.Infrastructure/PinyinAlphabet.cs
@@ -14,7 +14,7 @@ namespace Flow.Launcher.Infrastructure
 {
     public class PinyinAlphabet : IAlphabet
     {
-        private readonly ConcurrentDictionary<string, (string translation, TranslationMapping map)> _pinyinCache =
+        private ConcurrentDictionary<string, (string translation, TranslationMapping map)> _pinyinCache =
             new();
 
         private readonly Settings _settings;