diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 79e857311c1b020443f7e1b1220093ab4bf1d8fe..66cfc5bb5b1b47c19f96948d15bf879e44cba6e2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -59,6 +59,11 @@ losoto_norm:
   script:
     - cwl-runner --no-container steps/LoSoTo.Norm.cwl test_jobs/losoto_norm.json
 
+losoto_residual:
+  stage: test_steps
+  allow_failure: true
+  script:
+    - cwl-runner --no-container steps/LoSoTo.Residual.cwl test_jobs/losoto_residual.json
 
 parset_selector:
   stage: test_steps
diff --git a/steps/LoSoTo.Residual.cwl b/steps/LoSoTo.Residual.cwl
new file mode 100644
index 0000000000000000000000000000000000000000..e8aed596c8b965648201b33f045c6842dd9fac9c
--- /dev/null
+++ b/steps/LoSoTo.Residual.cwl
@@ -0,0 +1,52 @@
+#!/usr/bin/env cwl-runner
+
+class: CommandLineTool
+cwlVersion: v1.0
+id: losoto_abs
+
+doc: Subtract/divide two tables or a clock/tec/tec3rd/rm from a phase.
+
+requirements:
+  InitialWorkDirRequirement:
+    listing:
+      - entryname: 'parset.config'
+        entry: |
+          [residuals]
+          soltab = $(inputs.soltab)
+          operation=RESIDUALS
+          soltabsToSub=$(inputs.soltabsToSub)
+          ratio=$(inputs.ratio)
+
+      - entryname: $(inputs.input_h5parm.basename)
+        entry: $(inputs.input_h5parm)
+        writable: true
+
+baseCommand: "losoto"
+
+arguments:
+  - $(inputs.input_h5parm.basename)
+  - parset.config
+
+hints:
+  DockerRequirement:
+    dockerPull: lofareosc/prefactor-ci:master
+
+inputs:
+  - id: input_h5parm
+    type: File
+  - id: soltab
+    type: string
+    doc: "Solution table"
+  - id: soltabsToSub
+    type: string[]
+    doc: List of soltabs to subtract
+  - id: ratio
+    type: boolean?
+    default: false
+    doc: Return the ratio instead of subtracting.
+
+outputs:
+  - id: output_h5parm
+    type: File
+    outputBinding:
+      glob: $(inputs.input_h5parm.basename)
diff --git a/test_jobs/losoto_residual.json b/test_jobs/losoto_residual.json
new file mode 100644
index 0000000000000000000000000000000000000000..86b97d57348f716e4ffbc4399c02b4b1f038ba38
--- /dev/null
+++ b/test_jobs/losoto_residual.json
@@ -0,0 +1,8 @@
+{
+    "input_h5parm": {
+            "class": "File",
+            "path": "/data/example.h5"
+        },
+    "soltab": "sol000/amplitude000",
+    "soltabsToSub": ["amplitude000"]
+}