diff --git a/src/pipecraft-core/service_scripts/demux_paired_end_data.sh b/src/pipecraft-core/service_scripts/demux_paired_end_data.sh
index 045908b..69b08a7 100755
--- a/src/pipecraft-core/service_scripts/demux_paired_end_data.sh
+++ b/src/pipecraft-core/service_scripts/demux_paired_end_data.sh
@@ -49,6 +49,9 @@ output_dir=$"/input/demultiplex_out"
 #python module for assigning sample names as based on indexes file
 run_python_module=$"python3 /scripts/submodules/assign_sample_names.demuxModule.py $indexes_file"
 
+# Increase the number of open files limit
+ulimit -S -n 6000
+
 #############################
 ### Start of the workflow ###
 #############################
diff --git a/src/pipecraft-core/service_scripts/demux_single_end_data.sh b/src/pipecraft-core/service_scripts/demux_single_end_data.sh
index ead2673..3675030 100755
--- a/src/pipecraft-core/service_scripts/demux_single_end_data.sh
+++ b/src/pipecraft-core/service_scripts/demux_single_end_data.sh
@@ -41,6 +41,9 @@ source /scripts/submodules/framework.functions.sh
 #output dir
 output_dir=$"/input/demultiplex_out"
 
+# Increase the number of open files limit
+ulimit -S -n 6000
+
 #############################
 ### Start of the workflow ###
 #############################