diff --git a/ajax/currentphoto.php b/ajax/currentphoto.php
index d8afa060..d0654b17 100644
--- a/ajax/currentphoto.php
+++ b/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/ajax/oc_photo.php b/ajax/oc_photo.php
index 085d2710..184217f2 100644
--- a/ajax/oc_photo.php
+++ b/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:').$localpath);
diff --git a/ajax/savecrop.php b/ajax/savecrop.php
index cd470307..fe9e5c5b 100644
--- a/ajax/savecrop.php
+++ b/ajax/savecrop.php
@@ -71,7 +71,7 @@ if(file_exists($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/ajax/uploadimport.php b/ajax/uploadimport.php
index f4a13e0a..b11f380f 100644
--- a/ajax/uploadimport.php
+++ b/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($fn.' uploaded');
diff --git a/ajax/uploadphoto.php b/ajax/uploadphoto.php
index 99015e2d..dca8ede6 100644
--- a/ajax/uploadphoto.php
+++ b/ajax/uploadphoto.php
@@ -46,7 +46,7 @@ if ($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'])) {