diff --git a/apps/contacts/ajax/currentphoto.php b/apps/contacts/ajax/currentphoto.php
index d8afa060b1..d0654b17d6 100644
--- a/apps/contacts/ajax/currentphoto.php
+++ b/apps/contacts/ajax/currentphoto.php
@@ -40,7 +40,7 @@ if (!isset($_GET['id'])) {
 	bailOut(OC_Contacts_App::$l10n->t('No contact ID was submitted.'));
 }
 
-$tmpfname = tempnam("/tmp", "occOrig");
+$tmpfname = tempnam(get_temp_dir(), "occOrig");
 $contact = OC_Contacts_App::getContactVCard($_GET['id']);
 $image = new OC_Image();
 if(!$image) {
diff --git a/apps/contacts/ajax/oc_photo.php b/apps/contacts/ajax/oc_photo.php
index 085d2710f5..184217f2b7 100644
--- a/apps/contacts/ajax/oc_photo.php
+++ b/apps/contacts/ajax/oc_photo.php
@@ -42,7 +42,7 @@ if(!isset($_GET['path'])) {
 }
 
 $localpath = OC_Filesystem::getLocalFile($_GET['path']);
-$tmpfname = tempnam("/tmp", "occOrig");
+$tmpfname = tempnam(get_temp_dir(), "occOrig");
 
 if(!file_exists($localpath)) {
 	bailOut(OC_Contacts_App::$l10n->t('File doesn\'t exist:').$localpath);
diff --git a/apps/contacts/ajax/savecrop.php b/apps/contacts/ajax/savecrop.php
index cd47030712..fe9e5c5b99 100644
--- a/apps/contacts/ajax/savecrop.php
+++ b/apps/contacts/ajax/savecrop.php
@@ -71,7 +71,7 @@ if(file_exists($tmp_path)) {
 		OCP\Util::writeLog('contacts','savecrop.php, x: '.$x1.' y: '.$y1.' w: '.$w.' h: '.$h, OCP\Util::DEBUG);
 		if($image->crop($x1, $y1, $w, $h)) {
 			if(($image->width() <= 200 && $image->height() <= 200) || $image->resize(200)) {
-				$tmpfname = tempnam("/tmp", "occCropped"); // create a new file because of caching issues.
+				$tmpfname = tempnam(get_temp_dir(), "occCropped"); // create a new file because of caching issues.
 				if($image->save($tmpfname)) {
 					unlink($tmp_path);
 					$card = OC_Contacts_App::getContactVCard($id);
diff --git a/apps/contacts/ajax/uploadimport.php b/apps/contacts/ajax/uploadimport.php
index f4a13e0a4b..b11f380fa8 100644
--- a/apps/contacts/ajax/uploadimport.php
+++ b/apps/contacts/ajax/uploadimport.php
@@ -67,7 +67,7 @@ if($error !== UPLOAD_ERR_OK) {
 }
 $file=$_FILES['importfile'];
 
-$tmpfname = tempnam("/tmp", "occOrig");
+$tmpfname = tempnam(get_temp_dir(), "occOrig");
 if(file_exists($file['tmp_name'])) {
 	if($view->file_put_contents('/'.$tmpfile, file_get_contents($file['tmp_name']))) {
 		debug($fn.' uploaded');
diff --git a/apps/contacts/ajax/uploadphoto.php b/apps/contacts/ajax/uploadphoto.php
index 99015e2d50..dca8ede6d6 100644
--- a/apps/contacts/ajax/uploadphoto.php
+++ b/apps/contacts/ajax/uploadphoto.php
@@ -46,7 +46,7 @@ if ($fn) {
 		exit();
 	}
 	$id = $_GET['id'];
-	$tmpfname = tempnam('/tmp', 'occOrig');
+	$tmpfname = tempnam(get_temp_dir(), 'occOrig');
 	file_put_contents($tmpfname, file_get_contents('php://input'));
 	debug($tmpfname.' uploaded');
 	$image = new OC_Image();
@@ -93,7 +93,7 @@ if($error !== UPLOAD_ERR_OK) {
 }
 $file=$_FILES['imagefile'];
 
-$tmpfname = tempnam("/tmp", "occOrig");
+$tmpfname = tempnam(get_temp_dir(), "occOrig");
 if(file_exists($file['tmp_name'])) {
 	$image = new OC_Image();
 	if($image->loadFromFile($file['tmp_name'])) {
diff --git a/lib/helper.php b/lib/helper.php
index e3d292737a..537465b15a 100644
--- a/lib/helper.php
+++ b/lib/helper.php
@@ -514,7 +514,7 @@ class OC_Helper {
 	 * remove all files created by self::tmpFile
 	 */
 	public static function cleanTmp(){
-		$leftoversFile='/tmp/oc-not-deleted';
+		$leftoversFile=get_temp_dir().'/oc-not-deleted';
 		if(file_exists($leftoversFile)){
 			$leftovers=file($leftoversFile);
 			foreach($leftovers as $file) {
diff --git a/lib/migrate.php b/lib/migrate.php
index 8fb949d66e..f9cab915d0 100644
--- a/lib/migrate.php
+++ b/lib/migrate.php
@@ -146,7 +146,7 @@ class OC_Migrate{
 	 		case 'instance':
 	 			self::$content = new OC_Migration_Content( self::$zip );
 				// Creates a zip that is compatable with the import function
-				$dbfile = tempnam( "/tmp", "owncloud_export_data_" );
+				$dbfile = tempnam( get_temp_dir(), "owncloud_export_data_" );
 				OC_DB::getDbStructure( $dbfile, 'MDB2_SCHEMA_DUMP_ALL');
 
 				// Now add in *dbname* and *dbprefix*