diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index 039fa03976bc..b97bf26001a0 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -845,7 +845,8 @@ def gen_candidates():
_deprecated_ignore_map = {'nbagg.transparent': 'figure.facecolor'}
-_obsolete_set = {'plugins.directory', 'text.dvipnghack'}
+_obsolete_set = {'plugins.directory', 'text.dvipnghack', 'backend.qt4',
+ 'backend.qt5'}
# The following may use a value of None to suppress the warning.
_deprecated_set = {'axes.hold'} # do NOT include in _all_deprecated
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