diff --git a/openbis/dist/server/export-master-data.py b/openbis/dist/server/export-master-data.py
index df0d3a9da5580a6c685167a0f64f676916fe11a1..bd7c47978a481bacf40a78616ffc54f294bfd109 100644
--- a/openbis/dist/server/export-master-data.py
+++ b/openbis/dist/server/export-master-data.py
@@ -205,8 +205,8 @@ def exportDataSetType(dataSetType):
     code = codeLiteral(dataSetType.getCode())
     description = strLiteral(dataSetType.getDescription())
     dataSetKind = strLiteral(dataSetType.getDataSetKind())
-    mainDataSetPattern = dataSetType.getMainDataSetPattern()
-    mainDataSetPath = dataSetType.getMainDataSetPath()
+    mainDataSetPattern = strLiteral(dataSetType.getMainDataSetPattern())
+    mainDataSetPath = strLiteral(dataSetType.getMainDataSetPath())
     deletionDisallowed = dataSetType.isDeletionDisallowed()
     validationScript = createValidationScriptAssigment(dataSetType, var)
     if (dataSetType.getCode() in EXISTING_DATASET_TYPES):