diff --git a/modules/charon-core/src/main/java/org/wso2/charon3/core/utils/codeutils/FilterTreeManager.java b/modules/charon-core/src/main/java/org/wso2/charon3/core/utils/codeutils/FilterTreeManager.java
index 358666dc1..0b001ab8b 100644
--- a/modules/charon-core/src/main/java/org/wso2/charon3/core/utils/codeutils/FilterTreeManager.java
+++ b/modules/charon-core/src/main/java/org/wso2/charon3/core/utils/codeutils/FilterTreeManager.java
@@ -29,6 +29,7 @@
 import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.regex.Pattern;
 
 /**
@@ -115,7 +116,7 @@ public FilterTreeManager(String filterString, SCIMResourceTypeSchema schema) thr
                         tempTokenList.add(concatenatedString);
                         concatenatedString = "";
                     }
-                    tempTokenList.add(decodedValue);
+                    tempTokenList.add(decodedValue.toLowerCase(Locale.ENGLISH));
                 }
             } else if (input.ttype == '\"' || input.ttype == '\'') {
                 concatenatedString += " " + input.sval;