diff --git a/src/uk/org/floop/jenkins_pmd/Pipelines.groovy b/src/uk/org/floop/jenkins_pmd/Pipelines.groovy
index f5ca43b..551c371 100644
--- a/src/uk/org/floop/jenkins_pmd/Pipelines.groovy
+++ b/src/uk/org/floop/jenkins_pmd/Pipelines.groovy
@@ -76,7 +76,7 @@
         body.addTextBody('dataset-name', datasetName)
         body.addTextBody('dataset-slug', datasetPath)
         if (mapping.startsWith('http')) {
-            body.add(
+            body.addBinaryBody(
                     'columns-csv',
                     Request
                             .Get(mapping)