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 855437d..c5a8367 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -52,6 +52,7 @@ ynh_script_progression --message="Starting a systemd service..." --weight=5
 
 # Start a systemd service
 ynh_systemd_action --service_name=$app --action="start"
+wait_gunicorn_start
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/install b/scripts/install
index 7a373da..500c6b6 100755
--- a/scripts/install
+++ b/scripts/install
@@ -92,12 +92,7 @@ ynh_script_progression --message="Starting a systemd service..." --weight=1
 
 # Start a systemd service
 ynh_systemd_action --service_name=$app --action="start" --line_match="Listening at"
-
-# line_match isn't enough because ihatemoney may stop if database upgrades
-for _ in {1..20}; do
-	test -S /tmp/budget.gunicorn_$app.sock && break
-	sleep 1
-done
+wait_gunicorn_start
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/restore b/scripts/restore
index abe10cc..7a38992 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -64,12 +64,7 @@ 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=$app --action="start" --line_match="Listening at"
-
-# line_match isn't enough because ihatemoney may stop if database upgrades
-for _ in {1..20}; do
-	test -S /tmp/budget.gunicorn_$app.sock && break
-	sleep 1
-done
+wait_gunicorn_start
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/upgrade b/scripts/upgrade
index abc26b4..0f14b13 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -162,12 +162,7 @@ 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=$app --action="start" --line_match="Listening at"
-
-# line_match isn't enough because ihatemoney may stop if database upgrades
-for _ in {1..20}; do
-	test -S /tmp/budget.gunicorn_$app.sock && break
-	sleep 1
-done
+wait_gunicorn_start
 
 #=================================================
 # END OF SCRIPT