diff --git a/.gitignore b/.gitignore
index 57b6e0f..dd625ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,3 @@ out_tmpdir*/
 runs/
 *.simg
 slurm-*.out
-steps/*.cwl
diff --git a/Makefile b/Makefile
index cbc90bd..be02829 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,6 @@
 all: run
 SHELL=bash
 RUN := $(PWD)/runs/run_$(shell date +%F-%H-%M-%S)
-SINGULARITY_PREFIX=$(shell echo "singularity, exec, $(PWD)/prefactor.simg, " | sed -e 's/[\/&]/\\&/g')
 ARCHIVE=ftp://ftp.astron.nl/outgoing/EOSC/datasets/
 TINY=L591513_SB000_uv_delta_t_4.MS
 PULSAR=GBT_Lband_PSR.fil
@@ -44,7 +43,7 @@ data/$(SMALL)/: data/$(SMALL_ARCHIVE)
 small: data/$(SMALL)/
 	echo "data/$(SMALL)/ is downloaded"
 
-run-udocker: .virtualenv/bin/udocker steps/ndppp_prep_cal.cwl .virtualenv/bin/cwltool
+run-udocker: .virtualenv/bin/udocker .virtualenv/bin/cwltool
 	mkdir -p $(RUN)
 	.virtualenv/bin/cwltool \
 		--user-space-docker-cmd `pwd`/.virtualenv/bin/udocker \
@@ -53,7 +52,7 @@ run-udocker: .virtualenv/bin/udocker steps/ndppp_prep_cal.cwl .virtualenv/bin/cw
 		prefactor.cwl \
 		jobs/job_20sb.yaml > >(tee $(RUN)/output) 2> >(tee $(RUN)/log >&2)
 
-run: .virtualenv/bin/cwltool steps/ndppp_prep_cal.cwl
+run: .virtualenv/bin/cwltool
 	mkdir -p $(RUN)
 	.virtualenv/bin/cwltool \
 		--leave-tmpdir \
@@ -62,7 +61,7 @@ run: .virtualenv/bin/cwltool steps/ndppp_prep_cal.cwl
 		prefactor.cwl \
 		jobs/job_2sb.yaml > >(tee $(RUN)/output) 2> >(tee $(RUN)/log >&2)
 
-toil: data/$(SMALL)/ .virtualenv/bin/cwltoil steps/ndppp_prep_cal.cwl
+toil: data/$(SMALL)/ .virtualenv/bin/cwltoil
 	mkdir -p $(RUN)/results
 	.virtualenv/bin/toil-cwl-runner \
 		--logFile $(RUN)/log \
@@ -73,12 +72,11 @@ toil: data/$(SMALL)/ .virtualenv/bin/cwltoil steps/ndppp_prep_cal.cwl
 		prefactor.cwl \
 		jobs/job_20sb.yaml | tee $(RUN)/output
 
-slurm: data/$(SMALL) .virtualenv/bin/cwltoil singularity
+slurm: data/$(SMALL) .virtualenv/bin/cwltoil
 	mkdir -p $(RUN)/results
 	.virtualenv/bin/toil-cwl-runner \
 		--batchSystem=slurm  \
 		--preserve-environment PATH \
-		--no-container \
 		--logFile $(RUN)/log \
 		--outdir $(RUN)/results \
 		--jobStore file://$(RUN)/job_store \
@@ -93,7 +91,6 @@ mesos: data/$(SMALL)
 		--batchSystem=mesos \
 		--mesosMaster=145.100.59.50:5050 \
 		--preserve-environment PATH \
-		--no-container \
 		--logFile $(RUN)/log \
 		--outdir $(RUN)/results \
 		--jobStore file://$(RUN)/job_store \
@@ -107,11 +104,3 @@ prefactor.simg:
 	singularity build prefactor.simg docker://kernsuite/prefactor
 
 singularity: prefactor.simg
-	for i in `ls steps/*.in`; do sed 's/CMD_PREFIX/$(SINGULARITY_PREFIX)/g' $$i> $${i:0:-3}; done
-
-no-singularity:
-	for i in `ls steps/*.in`; do sed 's/CMD_PREFIX//g' $$i> $${i:0:-3}; done
-
-steps/ndppp_prep_cal.cwl:
-	$(error "Run '$ make singularity' or '$ make no-singularity' first")
-
diff --git a/README.md b/README.md
index ab5fee6..0410212 100644
--- a/README.md
+++ b/README.md
@@ -20,20 +20,6 @@ optional:
 * [Singularity](http://singularity.lbl.gov/)
 
 
-# preperations
-
-You first need to preprocess the CWL files since the standard
-doesn't support Singularity yet. If you want to use singularity run:
-
-```bash
-$ make singularity
-```
-
-otherwise run:
-```bash
-$ make no-singularity
-```
-
 # usage
 
 To run the pipeline with the example dataset just run:
diff --git a/steps/ampl.cwl.in b/steps/ampl.cwl
similarity index 92%
rename from steps/ampl.cwl.in
rename to steps/ampl.cwl
index c51ad9f..4ab615b 100644
--- a/steps/ampl.cwl.in
+++ b/steps/ampl.cwl
@@ -1,6 +1,6 @@
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXpython, /usr/lib/prefactor/scripts/amplitudes_losoto_3.py]
+baseCommand: [python, /usr/lib/prefactor/scripts/amplitudes_losoto_3.py]
 
 label: "Smooth amplitudes"
 
diff --git a/steps/calib_cal.cwl.in b/steps/calib_cal.cwl
similarity index 97%
rename from steps/calib_cal.cwl.in
rename to steps/calib_cal.cwl
index 899509e..f004370 100644
--- a/steps/calib_cal.cwl.in
+++ b/steps/calib_cal.cwl
@@ -29,7 +29,7 @@
 
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIX/usr/bin/calibrate-stand-alone]
+baseCommand: [/usr/bin/calibrate-stand-alone]
 
 label: "BBS calibrate"
 
diff --git a/steps/createmap_cal.cwl.in b/steps/createmap_cal.cwl
similarity index 98%
rename from steps/createmap_cal.cwl.in
rename to steps/createmap_cal.cwl
index a0d4bc5..06a8328 100644
--- a/steps/createmap_cal.cwl.in
+++ b/steps/createmap_cal.cwl
@@ -29,7 +29,7 @@
 
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXpython,
+baseCommand: [python,
              /usr/lib/python2.7/dist-packages/lofarpipe/recipes/plugins/PipelineStep_createMapfile.py,
              createmap_cal.mapfile]
 
diff --git a/steps/examine-npys.cwl.in b/steps/examine-npys.cwl
similarity index 89%
rename from steps/examine-npys.cwl.in
rename to steps/examine-npys.cwl
index 6ebff68..0e5ae61 100644
--- a/steps/examine-npys.cwl.in
+++ b/steps/examine-npys.cwl
@@ -1,6 +1,6 @@
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXpython, /usr/lib/prefactor/scripts/examine_npys.py]
+baseCommand: [python, /usr/lib/prefactor/scripts/examine_npys.py]
 
 hints:
   DockerRequirement:
diff --git a/steps/fitclock.cwl.in b/steps/fitclock.cwl
similarity index 93%
rename from steps/fitclock.cwl.in
rename to steps/fitclock.cwl
index dab13a1..0b92e9a 100644
--- a/steps/fitclock.cwl.in
+++ b/steps/fitclock.cwl
@@ -1,6 +1,6 @@
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXpython, /usr/lib/prefactor/scripts/fit_clocktec_initialguess_losoto.py]
+baseCommand: [python, /usr/lib/prefactor/scripts/fit_clocktec_initialguess_losoto.py]
 
 label: "Separate clock/TEC"
 
diff --git a/steps/h5imp_cal.cwl.in b/steps/h5imp_cal.cwl
similarity index 93%
rename from steps/h5imp_cal.cwl.in
rename to steps/h5imp_cal.cwl
index 4a9faaf..daa0fb1 100644
--- a/steps/h5imp_cal.cwl.in
+++ b/steps/h5imp_cal.cwl
@@ -1,6 +1,6 @@
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXpython, /usr/lib/prefactor/scripts/losotoImporter.py, losoto.h5]
+baseCommand: [python, /usr/lib/prefactor/scripts/losotoImporter.py, losoto.h5]
 
 label: "Convert solutions to H5parm"
 
diff --git a/steps/ndppp_prep_cal.cwl.in b/steps/ndppp_prep_cal.cwl
similarity index 98%
rename from steps/ndppp_prep_cal.cwl.in
rename to steps/ndppp_prep_cal.cwl
index bf9cb05..0c1f910 100644
--- a/steps/ndppp_prep_cal.cwl.in
+++ b/steps/ndppp_prep_cal.cwl
@@ -20,7 +20,7 @@
 
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXNDPPP, msout=calibrated.MS]
+baseCommand: [NDPPP, msout=calibrated.MS]
 
 label: "DPPP flag and average"
 
diff --git a/steps/phase.cwl.in b/steps/phase.cwl
similarity index 98%
rename from steps/phase.cwl.in
rename to steps/phase.cwl
index e35c8fb..303a3f3 100644
--- a/steps/phase.cwl.in
+++ b/steps/phase.cwl
@@ -6,7 +6,7 @@
 cwlVersion: v1.0
 class: CommandLineTool
 
-baseCommand: [CMD_PREFIXpython]
+baseCommand: [python]
 
 label: "Find global phase offset"
 
diff --git a/steps/plot_cal_phases.cwl.in b/steps/plot_cal_phases.cwl
similarity index 98%
rename from steps/plot_cal_phases.cwl.in
rename to steps/plot_cal_phases.cwl
index 66985c3..63b4b9e 100644
--- a/steps/plot_cal_phases.cwl.in
+++ b/steps/plot_cal_phases.cwl
@@ -20,7 +20,7 @@
 cwlVersion: v1.0
 class: CommandLineTool
 
-baseCommand: [CMD_PREFIXlosoto]
+baseCommand: [losoto]
 
 label: "Plot raw calibration results"
 
diff --git a/steps/plots.cwl.in b/steps/plots.cwl
similarity index 98%
rename from steps/plots.cwl.in
rename to steps/plots.cwl
index a201699..a649b0c 100644
--- a/steps/plots.cwl.in
+++ b/steps/plots.cwl
@@ -9,7 +9,7 @@
 
 cwlVersion: v1.0
 class: CommandLineTool
-baseCommand: [CMD_PREFIXpython]
+baseCommand: [python]
 
 label: "Plot clock, TEC, amplitude"
 
diff --git a/steps/sky_cal.cwl.in b/steps/sky_cal.cwl
similarity index 97%
rename from steps/sky_cal.cwl.in
rename to steps/sky_cal.cwl
index edb13e7..d565139 100644
--- a/steps/sky_cal.cwl.in
+++ b/steps/sky_cal.cwl
@@ -1,7 +1,7 @@
 cwlVersion: v1.0
 class: CommandLineTool
 
-baseCommand: [CMD_PREFIXpython]
+baseCommand: [python]
 
 label: "Find calibrator skymodel"