diff --git a/VERSIONS_HOTLINE/33756 b/VERSIONS_HOTLINE/33756
new file mode 100644
index 0000000000000000000000000000000000000000..72f69bcff118063c9940b11865ee04c46a0add1b
--- /dev/null
+++ b/VERSIONS_HOTLINE/33756
@@ -0,0 +1 @@
+ - ticket #33756 : Cosmogramme ne gère pas https avec Koha
\ No newline at end of file
diff --git a/library/Class/WebService/SIGB/AbstractRESTService.php b/library/Class/WebService/SIGB/AbstractRESTService.php
index 1303ebb6ebac571764193cc3bbe0ba4201af0624..6aa2c825958eda5f116f681641283eac8c341ccd 100644
--- a/library/Class/WebService/SIGB/AbstractRESTService.php
+++ b/library/Class/WebService/SIGB/AbstractRESTService.php
@@ -37,7 +37,9 @@ abstract class Class_WebService_SIGB_AbstractRESTService extends Class_WebServic
    * @return Class_WebService_SIGB_AbstractRESTService
    */
   public function setServerRoot($server_root) {
-    $this->_server_root = 'http://' . str_replace('http://', '', $server_root);
+    $this->_server_root = (false === strpos('https:://', $server_root)
+                           ? 'http://' . str_replace('http://', '', $server_root)
+                           : $server_root);
     return $this;
   }