diff --git a/config/vsc_hortense.py b/config/vsc_hortense.py
index 270cd66d..14d94c36 100644
--- a/config/vsc_hortense.py
+++ b/config/vsc_hortense.py
@@ -31,6 +31,7 @@ def command(self, job):
                 {
                     'name': 'cpu_rome_256gb',
                     'scheduler': 'slurm',
+                    'prepare_cmds': ['source /cvmfs/pilot.eessi-hpc.org/latest/init/bash'],
                     'access': hortense_access + ['--partition=cpu_rome'],
                     'environs': ['default'],
                     'descr': 'CPU nodes (AMD Rome, 256GiB RAM)',
@@ -51,6 +52,7 @@ def command(self, job):
                 {
                     'name': 'cpu_rome_512gb',
                     'scheduler': 'slurm',
+                    'prepare_cmds': ['source /cvmfs/pilot.eessi-hpc.org/latest/init/bash'],
                     'access': hortense_access + ['--partition=cpu_rome_512'],
                     'environs': ['default'],
                     'descr': 'CPU nodes (AMD Rome, 512GiB RAM)',
@@ -71,6 +73,7 @@ def command(self, job):
                 {
                     'name': 'cpu_milan',
                     'scheduler': 'slurm',
+                    'prepare_cmds': ['source /cvmfs/pilot.eessi-hpc.org/latest/init/bash'],
                     'access': hortense_access + ['--partition=cpu_milan'],
                     'environs': ['default'],
                     'descr': 'CPU nodes (AMD Milan, 256GiB RAM)',
@@ -91,6 +94,7 @@ def command(self, job):
                 {
                     'name': 'gpu_rome_a100_40gb',
                     'scheduler': 'slurm',
+                    'prepare_cmds': ['source /cvmfs/pilot.eessi-hpc.org/latest/init/bash'],
                     'access': hortense_access + ['--partition=cpu_rome_a100_40'],
                     'environs': ['default'],
                     'descr': 'GPU nodes (A100 40GB)',
@@ -127,6 +131,7 @@ def command(self, job):
                 {
                     'name': 'gpu_rome_a100_80gb',
                     'scheduler': 'slurm',
+                    'prepare_cmds': ['source /cvmfs/pilot.eessi-hpc.org/latest/init/bash'],
                     'access': hortense_access + ['--partition=cpu_rome_a100_80'],
                     'environs': ['default'],
                     'descr': 'GPU nodes (A100 80GB)',