diff --git a/vars/uploadTidy.groovy b/vars/uploadTidy.groovy
index 0506870..4387bcd 100644
--- a/vars/uploadTidy.groovy
+++ b/vars/uploadTidy.groovy
@@ -35,8 +35,8 @@
         String metadataGraph = "${datasetGraph}/metadata"
         drafter.deleteGraph(PMD, credentials, newJobDraft.id, metadataGraph)
         drafter.deleteGraph(PMD, credentials, newJobDraft.id, datasetGraph)
-        if (oldLabel) {
-            String oldDatasetPath = oldLabel
+        if (oldLabel != null) {
+            String oldDatasetPath = oldLabel.toLowerCase()
                     .replaceAll('[^\\w/]', '-')
                     .replaceAll('-+', '-')
                     .replaceAll('-\$', '')