diff --git a/scripts/install b/scripts/install
index d980b89..bca64e6 100755
--- a/scripts/install
+++ b/scripts/install
@@ -305,7 +305,7 @@ ynh_store_file_checksum "$final_path/config.ini"
 ### that really need such authorization.
 
 # Set permissions to app files
-chown -R $app: $final_path
+chown -R "$app":"$app" "$final_path"
 
 #=================================================
 # SETUP LOGROTATE
diff --git a/scripts/restore b/scripts/restore
index 12c349f..a427469 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -74,7 +74,7 @@ ynh_system_user_create "$app" "$final_path"
 #=================================================
 
 # Restore permissions on app files
-chown -R root: $final_path
+chown -R "$app":"$app" "$final_path"
 
 #=================================================
 # RESTORE THE PHP-FPM CONFIGURATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 18ddb49..ebdca4f 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -155,7 +155,7 @@ ynh_add_systemd_config
 #=================================================
 
 # Set permissions on app files
-chown -R $app: $final_path
+chown -R "$app":"$app" "$final_path"
 
 #=================================================
 # SETUP SSOWAT