diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f92dcb4d2c51caf363e3798ac1c9046793f5b79e..e947a25e8140e508951f408c0307ae918ad4625c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -53,7 +53,7 @@ trimData:
 downsampleData:
   stage: unit
   script:
-  - singularity run 'docker://bicf/seqtk:2.0.0' seqtk sample -s100 ./test_data/fastq/small/Q-Y5JA_1M_trimmed.fq.gz 1000 1> sampled.1.fq
+  - singularity exec 'docker://bicf/seqtk:2.0.0' seqtk sample -s100 ./test_data/fastq/small/Q-Y5JA_1M_trimmed.fq.gz 1000 1> sampled.1.fq
   - pytest -m downsampleData
 
 alignData: