diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
index 7a09d11f46f9..432bbb1ffdb6 100644
--- a/lib/matplotlib/backends/backend_qt.py
+++ b/lib/matplotlib/backends/backend_qt.py
@@ -856,7 +856,7 @@ def set_history_buttons(self):
 
 class SubplotToolQt(QtWidgets.QDialog):
     def __init__(self, targetfig, parent):
-        super().__init__()
+        super().__init__(parent)
         self.setWindowIcon(QtGui.QIcon(
             str(cbook._get_data_path("images/matplotlib.png"))))
         self.setObjectName("SubplotTool")