diff --git a/gns3server/modules/dynamips/dynamips_hypervisor.py b/gns3server/modules/dynamips/dynamips_hypervisor.py
index 2f6de303..e6ccc144 100644
--- a/gns3server/modules/dynamips/dynamips_hypervisor.py
+++ b/gns3server/modules/dynamips/dynamips_hypervisor.py
@@ -284,7 +284,7 @@ class DynamipsHypervisor:
                     if not line:
                         raise DynamipsError("No data returned from {host}:{port}, Dynamips process running: {run}"
                                             .format(host=self._host, port=self._port, run=self.is_running()))
-                    buf += line.decode()
+                    buf += line.decode("utf-8")
                 except OSError as e:
                     raise DynamipsError("Lost communication with {host}:{port} :{error}, Dynamips process running: {run}"
                                         .format(host=self._host, port=self._port, error=e, run=self.is_running()))
diff --git a/gns3server/modules/qemu/qemu_vm.py b/gns3server/modules/qemu/qemu_vm.py
index 58febeb7..b63a6111 100644
--- a/gns3server/modules/qemu/qemu_vm.py
+++ b/gns3server/modules/qemu/qemu_vm.py
@@ -644,7 +644,7 @@ class QemuVM(BaseVM):
                             break
                         for expect in expected:
                             if expect in line:
-                                result = line.decode().strip()
+                                result = line.decode("utf-8").strip()
                                 break
                 except EOFError as e:
                     log.warn("Could not read from QEMU monitor: {}".format(e))