diff --git a/workflow/rna-seq.nf b/workflow/rna-seq.nf
index f59b4891b9dbeb9ec619237fe9068f9861dbc34f..494055fd1573d95e697568a389cf05a0405c999a 100644
--- a/workflow/rna-seq.nf
+++ b/workflow/rna-seq.nf
@@ -61,7 +61,7 @@ process trackStart {
       "sessionId": "${workflow.sessionId}", \
       "pipeline": "gudmap.rbk_rnaseq", \
       "start": "${workflow.start}", \
-      "repRID": ${reRID}, \
+      "repRID": "${reRID}", \
       "astrocyte": false, \
       "status": "started", \
       "nextflowVersion": "${workflow.nextflow.version}", \