diff --git a/scripts/install b/scripts/install
index 0e30319..9b705b5 100755
--- a/scripts/install
+++ b/scripts/install
@@ -65,7 +65,9 @@ exec_occ() {
 
 # Set write access for the following commands
 find "$install_dir" -not \( -user $app -or -group www-data \) -exec chown $app:www-data {} \+
+chown $app:www-data "$install_dir"
 find "$data_dir" -not \( -user $app -or -group $app \) -exec chown $app: {} \+
+chown $app: "$data_dir"
 
 # Define password in an intermediate var
 # The fact that it's called _password allows it to be
@@ -236,7 +238,9 @@ ynh_multimedia_addaccess $app
 
 # Fix app ownerships & permissions
 find "$install_dir" -not \( -user $app -or -group www-data \) -exec chown $app:www-data {} \+
+chown $app:www-data "$install_dir"
 find "$data_dir" -not \( -user $app -or -group $app \) -exec chown $app: {} \+
+chown $app: "$data_dir"
 find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
 find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
 find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640
diff --git a/scripts/restore b/scripts/restore
index da7848e..5ef4f91 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -80,7 +80,9 @@ ynh_restore_file --origin_path="$data_dir" --not_mandatory
 
 # Fix app ownerships & permissions
 find "$install_dir" -not \( -user $app -or -group www-data \) -exec chown $app:www-data {} \+
+chown $app:www-data "$install_dir"
 find "$data_dir" -not \( -user $app -or -group $app \) -exec chown $app: {} \+
+chown $app: "$data_dir"
 find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
 find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
 find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640
diff --git a/scripts/upgrade b/scripts/upgrade
index 5d70446..76d424b 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -139,7 +139,9 @@ then
 
     # Set write access for the following commands
     find "$install_dir" -not \( -user $app -or -group www-data \) -exec chown $app:www-data {} \+
+    chown $app:www-data "$install_dir"
     find "$data_dir" -not \( -user $app -or -group $app \) -exec chown $app: {} \+
+    chown $app: "$data_dir"
 
     # Print the current version number of Nextcloud
     exec_occ -V
@@ -209,7 +211,9 @@ then
 
         # Set write access for the following commands
         find "$install_dir" -not \( -user $app -or -group www-data \) -exec chown $app:www-data {} \+
+        chown $app:www-data "$install_dir"
         find "$data_dir" -not \( -user $app -or -group $app \) -exec chown $app: {} \+
+        chown $app: "$data_dir"
 
         # Upgrade Nextcloud (SUCCESS = 0, UP_TO_DATE = 3)
         exec_occ maintenance:mode --off
@@ -327,7 +331,9 @@ ynh_script_progression --message="Reapplying file permissions..." --weight=2
 
 # Fix app ownerships & permissions
 find "$install_dir" -not \( -user $app -or -group www-data \) -exec chown $app:www-data {} \+
+chown $app:www-data "$install_dir"
 find "$data_dir" -not \( -user $app -or -group $app \) -exec chown $app: {} \+
+chown $app: "$data_dir"
 find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
 find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
 find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640