diff --git a/lib/matplotlib/backends/qt4_editor/formlayout.py b/lib/matplotlib/backends/qt4_editor/formlayout.py
index 271185e175d5..7ea016bbeabf 100644
--- a/lib/matplotlib/backends/qt4_editor/formlayout.py
+++ b/lib/matplotlib/backends/qt4_editor/formlayout.py
@@ -273,7 +273,10 @@ def setup(self):
                 field.setCurrentIndex(selindex)
             elif isinstance(value, bool):
                 field = QCheckBox(self)
-                field.setCheckState(Qt.Checked if value else Qt.Unchecked)
+                if value :
+                    field.setCheckState(Qt.Checked)
+                else :
+                    field.setCheckState(Qt.Unchecked)
             elif isinstance(value, float):
                 field = QLineEdit(repr(value), self)
             elif isinstance(value, int):