diff --git a/hmftools.wdl b/hmftools.wdl
index 8e60351b002d2a47a675ff9e56b63779398a7c58..1b9d8d220bd55c81f1131e54f957b3448f4b1910 100644
--- a/hmftools.wdl
+++ b/hmftools.wdl
@@ -247,8 +247,8 @@ task CuppaChart {
         set -e 
         mkdir -p ~{outputDir}
         cuppa-chart \
-        -sample ~{sampleName}
-        -sample_data ~{cupData}
+        -sample ~{sampleName} \
+        -sample_data ~{cupData} \
         -output_dir ~{outputDir}
     }