diff --git a/lib/matplotlib/backends/qt_compat.py b/lib/matplotlib/backends/qt_compat.py
index e2c6e1f44215..39f8050e70e3 100644
--- a/lib/matplotlib/backends/qt_compat.py
+++ b/lib/matplotlib/backends/qt_compat.py
@@ -26,6 +26,8 @@
QT_API_PYSIDE = "PySide"
QT_API_PYQT = "PyQt4" # Use the old sip v1 API (Py3 defaults to v2).
QT_API_ENV = os.environ.get("QT_API")
+if QT_API_ENV is not None:
+ QT_API_ENV = QT_API_ENV.lower()
# Mapping of QT_API_ENV to requested binding. ETS does not support PyQt4v1.
# (https://github.com/enthought/pyface/blob/master/pyface/qt/__init__.py)
_ETS = {"pyqt5": QT_API_PYQT5, "pyside2": QT_API_PYSIDE2,
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