diff --git a/package_check.sh b/package_check.sh
index 079de9c..f32b5c8 100755
--- a/package_check.sh
+++ b/package_check.sh
@@ -193,7 +193,8 @@ then
 	fi
 fi
 # Create the lock file
-echo "start:$(date +%s)" > "$lock_file"
+# $$ is the PID of package_check itself.
+echo "start:$(date +%s):$$" > "$lock_file"
 
 #=================================================
 # Check the internet connectivity
diff --git a/sub_scripts/lxc_force_stop.sh b/sub_scripts/lxc_force_stop.sh
index 89ea77a..49b7a0a 100755
--- a/sub_scripts/lxc_force_stop.sh
+++ b/sub_scripts/lxc_force_stop.sh
@@ -11,6 +11,12 @@ LXC_NAME=$(cat "$pcheck_config" | grep LXC_NAME= | cut -d '=' -f2)
 LXC_BRIDGE=$(cat "$pcheck_config" | grep LXC_BRIDGE= | cut -d '=' -f2)
 main_iface=$(cat "$pcheck_config" | grep iface= | cut -d '=' -f2)
 
+echo "> Arrêt de package_check"
+# Kill package_check
+# Retrieve the pid of Package check
+package_check_pid="$(cat "$script_dir/../pcheck.lock" | cut -d: -f3)"
+sudo kill --signal 15 $package_check_pid
+
 echo "> Arrêt du conteneur"
 if [ $(sudo lxc-info --name $LXC_NAME | grep -c "STOPPED") -eq 0 ]; then
 	echo "Arrêt du conteneur $LXC_NAME"
@@ -39,3 +45,5 @@ then
 fi
 
 sudo lxc-ls -f
+
+sudo rm "$script_dir/../pcheck.lock"
diff --git a/sub_scripts/testing_process.sh b/sub_scripts/testing_process.sh
index 4d60579..51630ba 100644
--- a/sub_scripts/testing_process.sh
+++ b/sub_scripts/testing_process.sh
@@ -1455,7 +1455,8 @@ TEST_LAUNCHER () {
 	stop_timer 2
 
 	# Update the lock file with the date of the last finished test.
-	echo "$1 $2:$(date +%s)" > "$lock_file"
+	# $$ is the PID of package_check itself.
+	echo "$1 $2:$(date +%s):$$" > "$lock_file"
 }
 
 set_witness_files () {