diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3fd403f..10939ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,8 @@ endif()
 
 # ==============================================================================
 
+set(CMAKE_CXX_STANDARD 17)
+
 include(projectheader)
 project_header(osdev_dbconnector)
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a367dc3..9fd9a1b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -25,12 +25,12 @@ endif()
 include(projectheader)
 project_header(dbconnector)
 
-find_package( Qt5Core REQUIRED )
-find_package( Qt5Sql REQUIRED )
+find_package( Qt6Core REQUIRED )
+find_package( Qt6Sql REQUIRED )
 
 include_directories( SYSTEM
-    ${Qt5Core_INCLUDE_DIRS}
-    ${Qt5Sql_INCLUDE_DIRS}
+    ${Qt6Core_INCLUDE_DIRS}
+    ${Qt6Sql_INCLUDE_DIRS}
 )
 
 include(compiler)
diff --git a/src/dbconnector.cpp b/src/dbconnector.cpp
index 6f84b24..0c50fa4 100644
--- a/src/dbconnector.cpp
+++ b/src/dbconnector.cpp
@@ -509,7 +509,7 @@ bool DbConnector::recordsExist( const QString& sTable, const QString& sField, co
     {
         valueList.append(this->toSqlValueString(v));
     }
-    QStringList uniqueValueList = valueList.toSet().toList();
+    QStringList uniqueValueList = valueList.toList();
     auto queryResult = this->executeQuery(countQuery
                                             .arg(this->quoteTableName(sTable))
                                             .arg(this->quoteFieldName(sField))
diff --git a/src/dbconnector.h b/src/dbconnector.h
index ecb432b..0eab291 100644
--- a/src/dbconnector.h
+++ b/src/dbconnector.h
@@ -38,7 +38,7 @@
 
 class QSqlQuery;
 class QString;
-class QStringList;
+//class QStringList;
 template<class K, class V> class QHash;
 class QSqlDatabase;