diff --git a/pyqtgraph/widgets/MatplotlibWidget.py b/pyqtgraph/widgets/MatplotlibWidget.py
index 232918ee..b3868e8f 100644
--- a/pyqtgraph/widgets/MatplotlibWidget.py
+++ b/pyqtgraph/widgets/MatplotlibWidget.py
@@ -1,18 +1,8 @@
 from ..Qt import QtGui, QtCore, QT_LIB
 import matplotlib
 
-if QT_LIB not in ['PyQt5', "PySide2"]:
-    if QT_LIB == 'PySide':
-        matplotlib.rcParams['backend.qt4']='PySide'
-
-    from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
-    try:
-        from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as NavigationToolbar
-    except ImportError:
-        from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar
-else:
-    from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
-    from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
+from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
+from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
 
 from matplotlib.figure import Figure