diff --git a/src/providers/ogr/qgsogrprovider.cpp b/src/providers/ogr/qgsogrprovider.cpp
index 15b339271ef..a528565a974 100644
--- a/src/providers/ogr/qgsogrprovider.cpp
+++ b/src/providers/ogr/qgsogrprovider.cpp
@@ -3628,7 +3628,7 @@ QSet<QVariant> QgsOgrProvider::uniqueValues( int index, int limit ) const
   if ( ( mGDALDriverName == QLatin1String( "GPKG" ) || mGDALDriverName == QLatin1String( "SQLite" ) )
        && mFirstFieldIsFid && index == 0 )
   {
-    sql += ", " + quotedIdentifier( textEncoding()->fromUnicode( fld.name() ) ) + " AS fid2";
+    sql += QStringLiteral( ", " ) + quotedIdentifier( textEncoding()->fromUnicode( fld.name() ) ) + QStringLiteral( " AS fid2" );
   }
 
   sql += " FROM " + quotedIdentifier( mOgrLayer->name() );