diff --git a/mod/admin.php b/mod/admin.php
index 6e18ec5c86..9400a28e04 100644
--- a/mod/admin.php
+++ b/mod/admin.php
@@ -281,6 +281,7 @@ function admin_page_site_post(&$a){
 	$lockpath		=	((x($_POST,'lockpath'))			? notags(trim($_POST['lockpath']))		: '');
 	$temppath		=	((x($_POST,'temppath'))			? notags(trim($_POST['temppath']))		: '');
 	$basepath		=	((x($_POST,'basepath'))			? notags(trim($_POST['basepath']))		: '');
+	$singleuser		=	((x($_POST,'singleuser'))		? notags(trim($_POST['singleuser']))		: '');
 
 	if($ssl_policy != intval(get_config('system','ssl_policy'))) {
 		if($ssl_policy == SSL_POLICY_FULL) {
@@ -342,7 +343,12 @@ function admin_page_site_post(&$a){
 		del_config('system','mobile-theme');
 	} else {
 		set_config('system','mobile-theme', $theme_mobile);
-	}
+        }
+        if ( $singleuser === '---' ) {
+            del_config('system','singleuser');
+        } else {
+            set_config('system','singleuser', $singleuser);
+        }
 	set_config('system','maximagesize', $maximagesize);
 	set_config('system','max_image_length', $maximagelength);
 	set_config('system','jpeg_quality', $jpegimagequality);
@@ -428,12 +434,19 @@ function admin_page_site(&$a) {
             if (file_exists($file . '/mobile')) {
                 $theme_choices_mobile[$f] = $theme_name;
             }
-			else {
+		else {
                 $theme_choices[$f] = $theme_name;
 			}
 		}
 	}
-	
+
+        /* get user names to make the install a personal install of X */
+        $user_names = array();
+        $user_names['---'] = t('Multi user instance');
+        $users = q("SELECT username, nickname FROM `user`");
+        foreach ($users as $user) {
+            $user_names[$user['nickname']] = $user['username'];
+        }
 	
 	/* Banner */
 	$banner = get_config('system','banner');
@@ -477,6 +490,7 @@ function admin_page_site(&$a) {
 		'$ssl_policy'		=> array('ssl_policy', t("SSL link policy"), (string) intval(get_config('system','ssl_policy')), t("Determines whether generated links should be forced to use SSL"), $ssl_choices),
 		'$new_share'		=> array('new_share', t("'Share' element"), get_config('system','new_share'), t("Activates the bbcode element 'share' for repeating items.")),
 		'$hide_help'		=> array('hide_help', t("Hide help entry from navigation menu"), get_config('system','hide_help'), t("Hides the menu entry for the Help pages from the navigation menu. You can still access it calling /help directly.")),
+		'$singleuser' 		=> array('singleuser', t("Single user instance"), get_config('system','singleuser'), t("Make this instance multi-user or single-user for the named user"), $user_names),
 		'$maximagesize'		=> array('maximagesize', t("Maximum image size"), get_config('system','maximagesize'), t("Maximum size in bytes of uploaded images. Default is 0, which means no limits.")),
 		'$maximagelength'		=> array('maximagelength', t("Maximum image length"), get_config('system','max_image_length'), t("Maximum length in pixels of the longest side of uploaded images. Default is -1, which means no limits.")),
 		'$jpegimagequality'		=> array('jpegimagequality', t("JPEG image quality"), get_config('system','jpeg_quality'), t("Uploaded JPEGS will be saved at this quality setting [0-100]. Default is 100, which is full quality.")),
diff --git a/view/admin_site.tpl b/view/admin_site.tpl
index 1a2a83339b..a6fe2d789c 100644
--- a/view/admin_site.tpl
+++ b/view/admin_site.tpl
@@ -52,6 +52,7 @@
 	{{ inc field_select.tpl with $field=$ssl_policy }}{{ endinc }}
 	{{ inc field_checkbox.tpl with $field=$new_share }}{{ endinc }}
 	{{ inc field_checkbox.tpl with $field=$hide_help }}{{ endinc }}
+	{{ inc field_select.tpl with $field=$singleuser }}{{ endinc }}
 
 	
 	<div class="submit"><input type="submit" name="page_site" value="$submit" /></div>
diff --git a/view/smarty3/admin_site.tpl b/view/smarty3/admin_site.tpl
index af78ca734b..bad0f52756 100644
--- a/view/smarty3/admin_site.tpl
+++ b/view/smarty3/admin_site.tpl
@@ -52,11 +52,12 @@
 	{{include file="field_input.tpl" field=$sitename}}
 	{{include file="field_textarea.tpl" field=$banner}}
 	{{include file="field_select.tpl" field=$language}}
-	{{include file="field_select.tpl" field=$theme}}
+        {{include file="field_select.tpl" field=$theme}}
 	{{include file="field_select.tpl" field=$theme_mobile}}
 	{{include file="field_select.tpl" field=$ssl_policy}}
 	{{include file="field_checkbox.tpl" field=$new_share}}
 	{{include file="field_checkbox.tpl" field=$hide_help}}
+        {{include file="field_select.tpl" field=$singleuser}}
 
 	
 	<div class="submit"><input type="submit" name="page_site" value="{{$submit}}" /></div>