diff --git a/ukui-search-app-data-service/app-db-manager.cpp b/ukui-search-app-data-service/app-db-manager.cpp
index 18b9dd3..1d6f023 100644
--- a/ukui-search-app-data-service/app-db-manager.cpp
+++ b/ukui-search-app-data-service/app-db-manager.cpp
@@ -1540,9 +1540,9 @@ QString AppDBManager::tranWinIdToDesktopFilePath(const QDBusVariant &id)
             QString classClass = info.windowClassClass(); //the 2nd part of WM_CLASS, specified by the application writer
             QSqlQuery query(m_database);
             query.setForwardOnly(true);
-            query.prepare("SELECT DESKTOP_FILE_PATH, START_UP_WMCLASS FROM APPINFO WHERE EXEC LIKE :classClass OR DESKTOP_FILE_PATH LIKE :classClass OR START_UP_WMCLASS=:windowClassClass");
+            query.prepare("SELECT DESKTOP_FILE_PATH, START_UP_WMCLASS FROM APPINFO WHERE EXEC LIKE :classClass OR DESKTOP_FILE_PATH LIKE :classClass OR LOWER(START_UP_WMCLASS)=:windowClassClass");
             query.bindValue(":classClass", "%" + classClass + "%");
-            query.bindValue(":windowClassClass", classClass);
+            query.bindValue(":windowClassClass", classClass.toLower());
 
             if (query.exec()) {
                 QMap<QString, QString> wmClassInfos;
@@ -1557,7 +1557,7 @@ QString AppDBManager::tranWinIdToDesktopFilePath(const QDBusVariant &id)
                         if (it.key().startsWith(AUTOSTART_APP_DESKTOP_PATH)) {
                             continue;
                         }
-                        if (it.key().section("/", -1) == (classClass + ".desktop") || it.value() == classClass) {
+                        if (it.key().section("/", -1) == (classClass + ".desktop") || it.value().toLower() == classClass.toLower()) {
                             desktopFilePath = it.key();
                             break;
                         }