diff --git a/Plugins/Wox.Plugin.Calculator/Main.cs b/Plugins/Wox.Plugin.Calculator/Main.cs
index c8c7fcb0b..113240c5e 100644
--- a/Plugins/Wox.Plugin.Calculator/Main.cs
+++ b/Plugins/Wox.Plugin.Calculator/Main.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Text.RegularExpressions;
 using System.Windows;
@@ -29,9 +29,12 @@ namespace Wox.Plugin.Caculator
         public List<Result> Query(Query query)
         {
             // Don't affect when user only input "e" or "i" keyword
-            if (query.Search.Length <= 2          
+            if (query.Search.Length < 2
                 || !RegValidExpressChar.IsMatch(query.Search)
-                || !IsBracketComplete(query.Search)) return new List<Result>();
+                || !IsBracketComplete(query.Search))
+            {
+                return new List<Result>();
+            }
 
             try
             {