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diff --git a/src/twisted/internet/gireactor.py b/src/twisted/internet/gireactor.py
index 92596db1da2..a577825a87e 100644
--- a/src/twisted/internet/gireactor.py
+++ b/src/twisted/internet/gireactor.py
@@ -24,6 +24,7 @@
from twisted.internet.error import ReactorAlreadyRunning
from twisted.internet import _glibbase
from twisted.python import runtime
+import gi
import gi.pygtkcompat
from gi.repository import GLib
@@ -68,6 +69,7 @@ class GIReactor(_glibbase.GlibReactorBase):
def __init__(self, useGtk=False):
_gtk = None
if useGtk is True:
+ gi.require_version("Gtk", "3.0")
from gi.repository import Gtk as _gtk
_glibbase.GlibReactorBase.__init__(self, GLib, _gtk, useGtk=useGtk)
@@ -112,6 +114,7 @@ class PortableGIReactor(_glibbase.PortableGlibReactorBase):
def __init__(self, useGtk=False):
_gtk = None
if useGtk is True:
+ gi.require_version("Gtk", "3.0")
from gi.repository import Gtk as _gtk
_glibbase.PortableGlibReactorBase.__init__(self, GLib, _gtk, useGtk=useGtk)
diff --git a/src/twisted/internet/test/test_gireactor.py b/src/twisted/internet/test/test_gireactor.py
index d15a9262248..af5092a3614 100644
--- a/src/twisted/internet/test/test_gireactor.py
+++ b/src/twisted/internet/test/test_gireactor.py
@@ -25,6 +25,9 @@
gtk3reactor = None
else:
gtk3reactor = _gtk3reactor
+ import gi # type: ignore[import]
+
+ gi.require_version("Gtk", "3.0")
from gi.repository import Gtk
from twisted.internet.error import ReactorAlreadyRunning
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