diff --git a/apptainer/bin/swiftest b/apptainer/bin/swiftest
index ca0fcfadd..5d91b80d6 100755
--- a/apptainer/bin/swiftest
+++ b/apptainer/bin/swiftest
@@ -1,4 +1,4 @@
 #!/bin/sh --
 OMP_NUM_THREADS=${OMP_NUM_THREADS:-`nproc --all`}
 FOR_COARRAY_NUM_IMAGES=${FOR_COARRAY_NUM_IMAGES:-1}
-apptainer run --bind $(pwd):$(pwd) --env OMP_NUM_THREADS=${OMP_NUM_THREADS},FOR_COARRAY_NUM_IMAGES=${FOR_COARRAY_NUM_IMAGES} ${SWIFTEST_SIF} "$@"
\ No newline at end of file
+apptainer run --bind $(pwd):$(pwd) --cleanenv --env OMP_NUM_THREADS=${OMP_NUM_THREADS},FOR_COARRAY_NUM_IMAGES=${FOR_COARRAY_NUM_IMAGES} ${SWIFTEST_SIF} "$@"
\ No newline at end of file
diff --git a/singularity/bin/swiftest b/singularity/bin/swiftest
index 8a5849e51..a384860fe 100755
--- a/singularity/bin/swiftest
+++ b/singularity/bin/swiftest
@@ -1,4 +1,4 @@
 #!/bin/sh --
 OMP_NUM_THREADS=${OMP_NUM_THREADS:-`nproc --all`}
 FOR_COARRAY_NUM_IMAGES=${FOR_COARRAY_NUM_IMAGES:-1}
-singularity run --bind $(pwd):$(pwd) --env OMP_NUM_THREADS=${OMP_NUM_THREADS},FOR_COARRAY_NUM_IMAGES=${FOR_COARRAY_NUM_IMAGES} ${SWIFTEST_SIF} "$@"
\ No newline at end of file
+singularity run --bind $(pwd):$(pwd) --cleanenv --env OMP_NUM_THREADS=${OMP_NUM_THREADS},FOR_COARRAY_NUM_IMAGES=${FOR_COARRAY_NUM_IMAGES} ${SWIFTEST_SIF} "$@"
\ No newline at end of file