diff --git a/config/vsc_hortense.py b/config/vsc_hortense.py
index 223783cb..612bdd6b 100644
--- a/config/vsc_hortense.py
+++ b/config/vsc_hortense.py
@@ -55,6 +55,7 @@ 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)',
@@ -74,6 +75,7 @@ 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)',
@@ -93,6 +95,7 @@ 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)',
@@ -112,6 +115,7 @@ 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)',
@@ -147,6 +151,7 @@ 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)',