diff --git a/freecad/plot/init_gui.py b/freecad/plot/init_gui.py
index 75c8c6e..2423705 100644
--- a/freecad/plot/init_gui.py
+++ b/freecad/plot/init_gui.py
@@ -26,8 +26,18 @@
 import os, sys
 
 import matplotlib
+
+# Force matplotlib to use PySide backend by temporarily unloading PyQt
+PyQt5WasLoaded = False
+if 'PyQt5.QtCore' in sys.modules:
+    del sys.modules['PyQt5.QtCore']
+    PyQt5WasLoaded = True
+
 import matplotlib.pyplot as plt
 
+if PyQt5WasLoaded:
+    import PyQt5.QtCore
+
 matplotlib.use("module://freecad.plot.freecad_backend")
 matplotlib.style.use('seaborn-colorblind')
 matplotlib.rcParams["figure.facecolor"] = "efefef"