diff --git a/VERSIONS_HOTLINE/74837 b/VERSIONS_HOTLINE/74837
new file mode 100644
index 0000000000000000000000000000000000000000..6cff7d2e26a21f5a6c6af0bc91edd73c608ee6ee
--- /dev/null
+++ b/VERSIONS_HOTLINE/74837
@@ -0,0 +1,2 @@
+ - ticket #74837 : correction de l'affichage du plan d'accès Open Street Map à partir de la fiche bibliothèque.
+ 
\ No newline at end of file
diff --git a/library/ZendAfi/View/Helper/LibrariesMap.php b/library/ZendAfi/View/Helper/LibrariesMap.php
index 0848c6a23fda4167aabaf1f46801de80cc8f0605..7a2d8cf39830452e713887223879bdf197539074 100644
--- a/library/ZendAfi/View/Helper/LibrariesMap.php
+++ b/library/ZendAfi/View/Helper/LibrariesMap.php
@@ -51,8 +51,8 @@ class ZendAfi_View_Helper_LibrariesMap extends ZendAfi_View_Helper_BaseHelper {
                            : '');
 
     $osm_layer = json_encode(isset($preferences['osm_layer'])
-                           ? $preferences['osm_layer']
-                           : '0');
+                             ? $preferences['osm_layer']
+                             : 1);
 
     return $this->_tag('div', '', ['id' => $container_id,
                                    'class' => 'leaflet_osm',
diff --git a/tests/library/ZendAfi/View/Helper/LibrariesMapTests.php b/tests/library/ZendAfi/View/Helper/LibrariesMapTests.php
index 9e60a0519d790a245052de4d69628c699dbe9026..cc2f5a57d3a63b22ba677db4150f7ca347cb03f2 100644
--- a/tests/library/ZendAfi/View/Helper/LibrariesMapTests.php
+++ b/tests/library/ZendAfi/View/Helper/LibrariesMapTests.php
@@ -73,4 +73,41 @@ class ZendAfi_View_Helper_Accueil_LibrariesMapTest extends ViewHelperTestCase {
   public function dataOsmLayerShouldBe1() {
     $this->assertXPath($this->html, '//div[contains(@data-osm-layer, "1")]');
   }
+}
+
+
+
+
+class ZendAfi_View_Helper_Accueil_LibrariesMapWithOutPreferencesTest extends ViewHelperTestCase {
+  protected $_storm_default_to_volatile = true;
+
+  public function setUp() {
+    parent::setUp();
+
+    $this->fixture('Class_Lieu',
+                   ['id' => 78,
+                    'libelle' => 'Cran-Gevrier']);
+
+    $this->fixture('Class_Lieu',
+                   ['id' => 65,
+                    'libelle' => 'Valleiry']);
+
+    $libraries = [$this->fixture('Class_Bib', ['id' => 3,
+                                               'libelle' => 'Cran-Gévrier',
+                                               'id_lieu' => 78]),
+
+                  $this->fixture('Class_Bib', ['id' => 89,
+                                               'libelle' => 'Valleiry',
+                                               'id_lieu' => 65])];
+
+    $this->_helper = new ZendAfi_View_Helper_LibrariesMap();
+    $this->_helper->setView(new ZendAfi_Controller_Action_Helper_View());
+    $this->html = $this->_helper->librariesMap($libraries, '1');
+  }
+
+
+  /** @test */
+  public function osmLayerShouldBe1() {
+    $this->assertXpath($this->html, '//div[@data-osm-layer="1"]');
+  }
 }
\ No newline at end of file