diff --git a/fsl_course/fdt1/test_topup_eddy.sh b/fsl_course/fdt1/test_topup_eddy.sh
index b60cab743e07b418367d45f5b0e589cf52fec845..a2e6242a18c4bc08f269d8b66700968dabd0cf20 100755
--- a/fsl_course/fdt1/test_topup_eddy.sh
+++ b/fsl_course/fdt1/test_topup_eddy.sh
@@ -40,13 +40,13 @@ if which eddy_openmp &> /dev/null; then
       --index=$subdatadir/index.txt --acqp=$subdatadir/acqparams.txt \
       --bvecs=$subdatadir/bvecs --bvals=$subdatadir/bvals \
       --fwhm=0 --topup=$outdir/topup_AP_PA_b0 --flm=quadratic \
-      --out=$outdir/eddy_unwarped_images & sleep 10; kill -TERM $!
+      --out=$outdir/eddy_unwarped_images & sleep 10; kill -s TERM $!
 elif which eddy &> /dev/null; then
     eddy --imain=$subdatadir/dwidata --mask=$outdir/hifi_nodif_brain_mask \
       --index=$subdatadir/index.txt --acqp=$subdatadir/acqparams.txt \
       --bvecs=$subdatadir/bvecs --bvals=$subdatadir/bvals \
       --fwhm=0 --topup=$outdir/topup_AP_PA_b0 --flm=quadratic \
-      --out=$outdir/eddy_unwarped_image & sleep 10; kill -TERM $!
+      --out=$outdir/eddy_unwarped_image & sleep 10;  kill -s TERM $!
 fi
 
 cp $subdatadir/pre_baked/eddy_unwarped_images* $outdir