diff --git a/src/freedombone-app-friendica b/src/freedombone-app-friendica
index ac806616..eb4f7d0b 100755
--- a/src/freedombone-app-friendica
+++ b/src/freedombone-app-friendica
@@ -242,7 +242,7 @@ function restore_local_friendica {
         if [ ! -d $friendica_dir/store/[data]/smarty3 ]; then
             mkdir -p $friendica_dir/store/[data]/smarty3
         fi
-        chmod 777 $friendica_dir/store/[data]/smarty3
+        chmod 1777 $friendica_dir/store/[data]/smarty3
         chown -R www-data:www-data $friendica_dir/*
         if [ -d $temp_restore_dir ]; then
             rm -rf $temp_restore_dir
@@ -276,7 +276,7 @@ function restore_remote_friendica {
         if [ ! -d /var/www/${FRIENDICA_DOMAIN_NAME}/htdocs/store/[data]/smarty3 ]; then
             mkdir -p /var/www/${FRIENDICA_DOMAIN_NAME}/htdocs/store/[data]/smarty3
         fi
-        chmod 777 /var/www/${FRIENDICA_DOMAIN_NAME}/htdocs/store/[data]/smarty3
+        chmod 1777 /var/www/${FRIENDICA_DOMAIN_NAME}/htdocs/store/[data]/smarty3
         chown -R www-data:www-data /var/www/${FRIENDICA_DOMAIN_NAME}/htdocs/*
     fi
     if [ -d /root/tempfriendica ]; then
@@ -531,11 +531,11 @@ function install_friendica {
     fi
     if [ ! -d "$FRIENDICA_PATH/store/[data]/smarty3" ]; then
         mkdir "$FRIENDICA_PATH/store/[data]/smarty3"
-        chmod 777 "$FRIENDICA_PATH/store/[data]/smarty3"
+        chmod 1777 "$FRIENDICA_PATH/store/[data]/smarty3"
     fi
-    chmod 777 $FRIENDICA_PATH/view/tpl
+    chmod 1777 $FRIENDICA_PATH/view/tpl
     chown -R www-data:www-data "$FRIENDICA_PATH/store"
-    chmod 777 $FRIENDICA_PATH/view/tpl/smarty3
+    chmod 1777 $FRIENDICA_PATH/view/tpl/smarty3
 
     # Ensure that the database gets backed up locally, if remote
     # backups are not being used
diff --git a/src/freedombone-app-hubzilla b/src/freedombone-app-hubzilla
index 3adde17f..f9ebb32a 100755
--- a/src/freedombone-app-hubzilla
+++ b/src/freedombone-app-hubzilla
@@ -233,7 +233,7 @@ function restore_local_hubzilla {
         if [ ! -d $hubzilla_dir/store/[data]/smarty3 ]; then
             mkdir -p $hubzilla_dir/store/[data]/smarty3
         fi
-        chmod 777 $hubzilla_dir/store/[data]/smarty3
+        chmod 1777 $hubzilla_dir/store/[data]/smarty3
         chown -R www-data:www-data $hubzilla_dir/*
         if [ -d $temp_restore_dir ]; then
             rm -rf $temp_restore_dir
@@ -267,7 +267,7 @@ function restore_remote_hubzilla {
         if [ ! -d /var/www/${HUBZILLA_DOMAIN_NAME}/htdocs/store/[data]/smarty3 ]; then
             mkdir -p /var/www/${HUBZILLA_DOMAIN_NAME}/htdocs/store/[data]/smarty3
         fi
-        chmod 777 /var/www/${HUBZILLA_DOMAIN_NAME}/htdocs/store/[data]/smarty3
+        chmod 1777 /var/www/${HUBZILLA_DOMAIN_NAME}/htdocs/store/[data]/smarty3
         chown -R www-data:www-data /var/www/${HUBZILLA_DOMAIN_NAME}/htdocs/*
     fi
     if [ -d /root/temphubzilla ]; then
@@ -526,11 +526,11 @@ function install_hubzilla {
     fi
     if [ ! -d "$HUBZILLA_PATH/store/[data]/smarty3" ]; then
         mkdir "$HUBZILLA_PATH/store/[data]/smarty3"
-        chmod 777 "$HUBZILLA_PATH/store/[data]/smarty3"
+        chmod 1777 "$HUBZILLA_PATH/store/[data]/smarty3"
     fi
-    chmod 777 $HUBZILLA_PATH/view/tpl
+    chmod 1777 $HUBZILLA_PATH/view/tpl
     chown -R www-data:www-data "$HUBZILLA_PATH/store"
-    chmod 777 $HUBZILLA_PATH/view/tpl/smarty3
+    chmod 1777 $HUBZILLA_PATH/view/tpl/smarty3
 
     # Ensure that the database gets backed up locally, if remote
     # backups are not being used
diff --git a/src/freedombone-app-lychee b/src/freedombone-app-lychee
index fcb969c3..1840fd8e 100755
--- a/src/freedombone-app-lychee
+++ b/src/freedombone-app-lychee
@@ -404,8 +404,8 @@ function install_lychee {
     function_check configure_php
     configure_php
 
-    chmod -R 777 /var/www/$LYCHEE_DOMAIN_NAME/htdocs/uploads/
-    chmod -R 777 /var/www/$LYCHEE_DOMAIN_NAME/htdocs/data/
+    chmod -R 1777 /var/www/$LYCHEE_DOMAIN_NAME/htdocs/uploads/
+    chmod -R 1777 /var/www/$LYCHEE_DOMAIN_NAME/htdocs/data/
     chown -R www-data:www-data /var/www/$LYCHEE_DOMAIN_NAME/htdocs
 
     chmod 755 /var/www/$LYCHEE_DOMAIN_NAME/htdocs/uploads/big/index.html
diff --git a/src/freedombone-app-postactiv b/src/freedombone-app-postactiv
index ea7f9b7c..75dbdf1a 100755
--- a/src/freedombone-app-postactiv
+++ b/src/freedombone-app-postactiv
@@ -531,7 +531,7 @@ function install_postactiv_main {
     chmod a+w /var/www/$POSTACTIV_DOMAIN_NAME/htdocs/file
     chown -R www-data:www-data /var/www/$POSTACTIV_DOMAIN_NAME/htdocs
     chmod +x /var/www/$POSTACTIV_DOMAIN_NAME/htdocs/scripts/maildaemon.php
-    chmod 777 /var/www/$POSTACTIV_DOMAIN_NAME/htdocs/extlib/HTMLPurifier/HTMLPurifier/DefinitionCache/Serializer.php
+    chmod 1777 /var/www/$POSTACTIV_DOMAIN_NAME/htdocs/extlib/HTMLPurifier/HTMLPurifier/DefinitionCache/Serializer.php
 
     function_check postactiv_create_database
     postactiv_create_database