diff --git a/src/modules/launcher/Wox.Infrastructure/StringMatcher.cs b/src/modules/launcher/Wox.Infrastructure/StringMatcher.cs
index 8679f18bb2..098d66766d 100644
--- a/src/modules/launcher/Wox.Infrastructure/StringMatcher.cs
+++ b/src/modules/launcher/Wox.Infrastructure/StringMatcher.cs
@@ -96,7 +96,19 @@ namespace Wox.Infrastructure
                     spaceIndices.Add(compareStringIndex);
                 }
 
-                if (fullStringToCompareWithoutCase[compareStringIndex] != currentQuerySubstring[currentQuerySubstringCharacterIndex])
+                bool compareResult;
+                if (opt.IgnoreCase)
+                {
+                    var fullStringToCompare = fullStringToCompareWithoutCase[compareStringIndex].ToString();
+                    var querySubstring = currentQuerySubstring[currentQuerySubstringCharacterIndex].ToString();
+                    compareResult = string.Compare(fullStringToCompare, querySubstring, CultureInfo.CurrentCulture, CompareOptions.IgnoreCase | CompareOptions.IgnoreNonSpace) != 0;
+                }
+                else
+                {
+                    compareResult = fullStringToCompareWithoutCase[compareStringIndex] != currentQuerySubstring[currentQuerySubstringCharacterIndex];
+                }
+
+                if (compareResult)
                 {
                     matchFoundInPreviousLoop = false;
                     continue;