diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c5a0ec4293a731f76b0f06c34a5e8bb8b965cc6c..5a9c93c0d747b0218ec1407002d7d376e34a2421 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,7 +30,7 @@ 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:
@@ -40,7 +40,7 @@ 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:
@@ -50,7 +50,7 @@ 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:
@@ -60,7 +60,7 @@ 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
 
@@ -69,7 +69,7 @@ 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
 
@@ -78,5 +78,5 @@ 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