diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bde45e13872f96519e3d9c36f8009d680f675113..732c04c86db9bfc4983d9002855744f97d549df7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -35,7 +35,7 @@ single_end_mouse:
   only:
     - master
   script:
-  - nextflow run workflow/main.nf --astrocyte true
+  - NXF_OPTS="-Dleveldb.mmap=false" nextflow run workflow/main.nf --astrocyte true
   - pytest -m singleend
 
 paired_end_human:
@@ -45,7 +45,7 @@ paired_end_human:
   except:
     - master
   script:
-  - nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_ENCSR729LGA_PE.txt" --genome 'GRCh38' --pairedEnd true --astrocyte false
+  - NXF_OPTS="-Dleveldb.mmap=false" nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_ENCSR729LGA_PE.txt" --genome 'GRCh38' --pairedEnd true --astrocyte false
   - pytest -m pairedend
 
 single_end_single_control:
@@ -55,7 +55,7 @@ single_end_single_control:
   except:
     - master
   script:
-  - nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_single_contol_SE.txt" --genome 'GRCh38' --pairedEnd false --astrocyte false
+  - NXF_OPTS="-Dleveldb.mmap=false" nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_single_contol_SE.txt" --genome 'GRCh38' --pairedEnd false --astrocyte false
   - pytest -m singlecontrol
 
 single_end_diff:
@@ -65,7 +65,7 @@ single_end_diff:
   except:
     - master
   script:
-  - nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_diff_SE.txt" --genome 'GRCm38' --astrocyte false
+  - NXF_OPTS="-Dleveldb.mmap=false" nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_diff_SE.txt" --genome 'GRCm38' --astrocyte false
   - pytest -m singleend
   - pytest -m singlediff
 
@@ -74,7 +74,7 @@ paired_end_diff:
     - master
   stage: multiple
   script:
-  - nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_diff_PE.txt" --genome 'GRCh38' --pairedEnd true --astrocyte false
+  - NXF_OPTS="-Dleveldb.mmap=false" nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_diff_PE.txt" --genome 'GRCh38' --pairedEnd true --astrocyte false
   - pytest -m pairedend
   - pytest -m paireddiff
 
@@ -83,5 +83,5 @@ single_end_skip:
   only:
     - master
   script:
-  - nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_diff_SE.txt" --genome 'GRCm38' --skipDiff true --skipMotif true --skipPlotProfile true --astrocyte false
+  - NXF_OPTS="-Dleveldb.mmap=false" nextflow run workflow/main.nf --designFile "$CI_PROJECT_DIR/test_data/design_diff_SE.txt" --genome 'GRCm38' --skipDiff true --skipMotif true --skipPlotProfile true --astrocyte false
   - pytest -m singleskip_true