diff --git a/lib/Command/PlacesSetup.php b/lib/Command/PlacesSetup.php
index 7609aaf5..5fbebce9 100644
--- a/lib/Command/PlacesSetup.php
+++ b/lib/Command/PlacesSetup.php
@@ -228,7 +228,7 @@ class PlacesSetup extends Command
                     }
 
                     if (GIS_TYPE_MYSQL === $this->gisType) {
-                        $points = implode(',', array_map(function (&$point) {
+                        $points = implode(',', array_map(function ($point) {
                             $x = $point[0];
                             $y = $point[1];
 
@@ -237,7 +237,7 @@ class PlacesSetup extends Command
 
                         $geometry = "POLYGON(({$points}))";
                     } elseif (GIS_TYPE_POSTGRES === $this->gisType) {
-                        $geometry = implode(',', array_map(function (&$point) {
+                        $geometry = implode(',', array_map(function ($point) {
                             $x = $point[0];
                             $y = $point[1];
 
diff --git a/lib/Controller/PlacesController.php b/lib/Controller/PlacesController.php
index 4d93c89b..46174f0f 100644
--- a/lib/Controller/PlacesController.php
+++ b/lib/Controller/PlacesController.php
@@ -90,7 +90,7 @@ class PlacesController extends ApiBase
         shuffle($list);
 
         // Get preview from image list
-        return $this->getPreviewFromImageList(array_map(static function (&$item) {
+        return $this->getPreviewFromImageList(array_map(function ($item) {
             return (int) $item['fileid'];
         }, $list));
     }
diff --git a/lib/Controller/TagsController.php b/lib/Controller/TagsController.php
index 8e369492..b6383d24 100644
--- a/lib/Controller/TagsController.php
+++ b/lib/Controller/TagsController.php
@@ -92,7 +92,7 @@ class TagsController extends ApiBase
         shuffle($list);
 
         // Get preview from image list
-        return $this->getPreviewFromImageList(array_map(static function (&$item) {
+        return $this->getPreviewFromImageList(array_map(function ($item) {
             return (int) $item['fileid'];
         }, $list));
     }