diff --git a/gns3server/modules/port_manager.py b/gns3server/modules/port_manager.py
index f1af09f8..b0f882d8 100644
--- a/gns3server/modules/port_manager.py
+++ b/gns3server/modules/port_manager.py
@@ -252,19 +252,14 @@ class PortManager:
         project.record_udp_port(port)
         log.debug("UDP port {} has been reserved".format(port))
 
-    def release_udp_port(self, port, project, force_remove=False):
+    def release_udp_port(self, port, project):
         """
         Release a specific UDP port number
 
         :param port: UDP port number
         :param project: Project instance
-        :param force_remove: Force port removal even on Darwnin
         """
 
-        # A bug with Dynamips on Darwin which doesn't correctly free UDP ports, they are freed only when changing the project
-        if sys.platform.startswith("darwin") and force_remove is False:
-            return
-
         if port in self._used_udp_ports:
             self._used_udp_ports.remove(port)
             project.remove_udp_port(port)
diff --git a/gns3server/modules/project.py b/gns3server/modules/project.py
index fa71ab51..582ef2ae 100644
--- a/gns3server/modules/project.py
+++ b/gns3server/modules/project.py
@@ -365,7 +365,7 @@ class Project:
         for port in self._used_tcp_ports.copy():
             port_manager.release_tcp_port(port, self)
         for port in self._used_udp_ports.copy():
-            port_manager.release_udp_port(port, self, force_remove=True)
+            port_manager.release_udp_port(port, self)
 
     @asyncio.coroutine
     def commit(self):