diff --git a/rootfs/etc/services.d/mlat-client/run b/rootfs/etc/services.d/mlat-client/run
index 8309710..d5ffaaa 100644
--- a/rootfs/etc/services.d/mlat-client/run
+++ b/rootfs/etc/services.d/mlat-client/run
@@ -17,7 +17,7 @@
 # If not, see <https://www.gnu.org/licenses/>.
 #---------------------------------------------------------------------------------------------
 
-trap "pkill -P $$ || true; s6wrap --quiet --timestamps --prepend=mlat-client --args echo 'service stopping'; exit 0" SIGTERM SIGINT SIGHUP SIGQUIT
+trap 'pkill -P "$$" || true; s6wrap --quiet --timestamps --prepend=mlat-client --args echo "service stopping"; exit 0' SIGTERM SIGINT SIGHUP SIGQUIT
 
 APPNAME="mlat-client"
 s6wrap=(s6wrap --quiet --timestamps --prepend="${APPNAME}")