diff --git a/scripts/func_tests/tests_post-install_0base.sh b/scripts/func_tests/tests_post-install_0base.sh
index d6c4af98e..8c631d794 100755
--- a/scripts/func_tests/tests_post-install_0base.sh
+++ b/scripts/func_tests/tests_post-install_0base.sh
@@ -7,6 +7,8 @@ echo $PATH
 
 sudo cp /etc/crowdsec/config.yaml ./config.yaml.backup
 
+CROWDSEC_PATH=$(which crowdsec)
+
 ##########################
 ## TEST AGENT/LAPI/CAPI ##
 echo "CROWDSEC (AGENT+LAPI+CAPI)"
@@ -51,15 +53,15 @@ ${CSCLI} metrics || fail "failed to get metrics"
 
 ${SYSTEMCTL} stop crowdsec || fail "crowdsec should be down"
 
+sudo mkdir -p /etc/systemd/system/crowdsec.service.d/
+
 #######################
 ## TEST WITHOUT LAPI ##
 
 echo "CROWDSEC (AGENT)"
 
 # test with -no-api flag
-cp ${SYSTEMD_SERVICE_FILE} /tmp/crowdsec.service-orig
-sed '/^ExecStart/ s/$/ -no-api/' ${SYSTEMD_SERVICE_FILE} > /tmp/crowdsec.service 
-sudo mv /tmp/crowdsec.service /etc/systemd/system/crowdsec.service
+echo -ne "[Service]\nExecStart=\nExecStart=${CROWDSEC_PATH} -c /etc/crowdsec/config.yaml -no-api\n" | sudo tee /etc/systemd/system/crowdsec.service.d/override.conf
 
 ${SYSTEMCTL} daemon-reload
 ${SYSTEMCTL} start crowdsec
@@ -67,8 +69,6 @@ sleep 1
 pidof crowdsec && fail "crowdsec shouldn't run without LAPI (in flag)"
 ${SYSTEMCTL} stop crowdsec
 
-sudo cp /tmp/crowdsec.service-orig /etc/systemd/system/crowdsec.service
-
 ${SYSTEMCTL} daemon-reload
 
 # test with no api server in configuration file
@@ -98,17 +98,15 @@ sudo cp ./config/config.yaml /etc/crowdsec/config.yaml
 echo "CROWDSEC (LAPI+CAPI)"
 
 # test with -no-cs flag
-sed '/^ExecStart/ s/$/ -no-cs/' /etc/systemd/system/crowdsec.service > /tmp/crowdsec.service 
-sudo mv /tmp/crowdsec.service /etc/systemd/system/crowdsec.service 
-
+echo -ne "[Service]\nExecStart=\nExecStart=${CROWDSEC_PATH} -c /etc/crowdsec/config.yaml -no-cs" | sudo tee /etc/systemd/system/crowdsec.service.d/override.conf
 
 ${SYSTEMCTL} daemon-reload
-${SYSTEMCTL} start crowdsec 
+sudo rm -f /var/log/crowdsec.log
+${SYSTEMCTL} start crowdsec
 wait_for_service "crowdsec LAPI should run without agent (in flag)"
 ${SYSTEMCTL} stop crowdsec
 
-sed '/^ExecStart/s/-no-cs//g' ${SYSTEMD_SERVICE_FILE} > /tmp/crowdsec.service
-sudo mv /tmp/crowdsec.service /etc/systemd/system/crowdsec.service
+echo -ne "[service]\nExecStart=\nExecStart=${CROWDSEC_PATH} -c /etc/crowdsec/config.yaml" | sudo tee /etc/systemd/system/crowdsec.service.d/override.conf
 
 ${SYSTEMCTL} daemon-reload
 
@@ -131,7 +129,8 @@ ${CSCLI_BIN} -c ./config/config_no_agent.yaml metrics || fail "failed to get met
 
 ${SYSTEMCTL} stop crowdsec
 sudo cp ./config/config.yaml /etc/crowdsec/config.yaml
-
+rm -f /etc/systemd/system/crowdsec.service.d/override.conf
+${SYSTEMCTL} daemon-reload
 
 #######################
 ## TEST WITHOUT CAPI ##
@@ -153,8 +152,6 @@ ${CSCLI} -c ./config/config_no_capi.yaml lapi status || fail "lapi status failed
 ## metrics
 ${CSCLI_BIN} -c ./config/config_no_capi.yaml metrics || fail "failed to get metrics"
 
-sudo mv /tmp/crowdsec.service-orig /etc/systemd/system/crowdsec.service 
-
 sudo cp ./config.yaml.backup /etc/crowdsec/config.yaml 
 
 ${SYSTEMCTL} daemon-reload