diff --git a/scripts/_common.sh b/scripts/_common.sh
index b806c2b..341ea2e 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -10,12 +10,19 @@ pip_dependencies=(
     'PyMySQL>=0.9,<1.1'
 )
 
-### Constants
 
 #=================================================
 # PERSONAL HELPERS
 #=================================================
 
+wait_gunicorn_start() {
+    # line_match isn't enough because ihatemoney may stop if database upgrades
+    for _ in {1..20}; do
+        test -S /tmp/budget.gunicorn_$app.sock && break
+        sleep 1
+    done
+}
+
 __ynh_python_venv_setup() {
     local -A args_array=( [d]=venv_dir= [p]=packages= )
     local venv_dir
diff --git a/scripts/change_url b/scripts/change_url
index b6f2645..0f44907 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -50,6 +50,7 @@ ynh_script_progression --message="Starting a systemd service..." --weight=5
 
 # Start a systemd service
 ynh_systemd_action --service_name=$app --action="start" --log_path=systemd
+wait_gunicorn_start
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/install b/scripts/install
index 761ec72..c9813aa 100755
--- a/scripts/install
+++ b/scripts/install
@@ -88,12 +88,7 @@ ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 # Start a systemd service
 ynh_systemd_action --service_name=$app --action="start" --log_path="systemd" --line_match="Listening at"
-
-# line_match isn't enough because ihatemoney may stop if database upgrades
-for _ in {1..20}; do
-	test -S /tmp/budget.gunicorn_$app.sock && break
-	sleep 1
-done
+wait_gunicorn_start
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/restore b/scripts/restore
index aaf2d5e..3f234ac 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -58,12 +58,7 @@ yunohost service add $app --description="$app daemon for IHateMoney" --log=syste
 ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 ynh_systemd_action --service_name=$app --action="start" --log_path="systemd" --line_match="Listening at"
-
-# line_match isn't enough because ihatemoney may stop if database upgrades
-for _ in {1..20}; do
-	test -S /tmp/budget.gunicorn_$app.sock && break
-	sleep 1
-done
+wait_gunicorn_start
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 76e1235..3d88c4c 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -155,12 +155,7 @@ yunohost service add $app --description="$app daemon for IHateMoney" --log=syste
 ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 ynh_systemd_action --service_name=$app --action="start" --log_path="systemd" --line_match="Listening at"
-
-# line_match isn't enough because ihatemoney may stop if database upgrades
-for _ in {1..20}; do
-	test -S /tmp/budget.gunicorn_$app.sock && break
-	sleep 1
-done
+wait_gunicorn_start
 
 #=================================================
 # END OF SCRIPT