diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
index 162af99f0efa..7fa9abc59a16 100644
--- a/lib/matplotlib/backends/backend_qt5.py
+++ b/lib/matplotlib/backends/backend_qt5.py
@@ -17,7 +17,7 @@
 from . import qt_compat
 from .qt_compat import (
     QtCore, QtGui, QtWidgets, __version__, QT_API,
-    _devicePixelRatioF, _isdeleted, _setDevicePixelRatioF,
+    _devicePixelRatioF, _isdeleted, _setDevicePixelRatio,
 )
 
 backend_version = __version__
@@ -707,7 +707,7 @@ def _icon(self, name):
         if QtCore.qVersion() >= '5.':
             name = name.replace('.png', '_large.png')
         pm = QtGui.QPixmap(str(cbook._get_data_path('images', name)))
-        _setDevicePixelRatioF(pm, _devicePixelRatioF(self))
+        _setDevicePixelRatio(pm, _devicePixelRatioF(self))
         if self.palette().color(self.backgroundRole()).value() < 128:
             icon_color = self.palette().color(self.foregroundRole())
             mask = pm.createMaskFromColor(QtGui.QColor('black'),
diff --git a/lib/matplotlib/backends/backend_qt5agg.py b/lib/matplotlib/backends/backend_qt5agg.py
index c46e493f9cf1..80e670b3f3e4 100644
--- a/lib/matplotlib/backends/backend_qt5agg.py
+++ b/lib/matplotlib/backends/backend_qt5agg.py
@@ -11,7 +11,7 @@
 from .backend_qt5 import (
     QtCore, QtGui, QtWidgets, _BackendQT5, FigureCanvasQT, FigureManagerQT,
     NavigationToolbar2QT, backend_version)
-from .qt_compat import QT_API, _setDevicePixelRatioF
+from .qt_compat import QT_API, _setDevicePixelRatio
 
 
 class FigureCanvasQTAgg(FigureCanvasAgg, FigureCanvasQT):
@@ -64,7 +64,7 @@ def paintEvent(self, event):
 
             qimage = QtGui.QImage(buf, buf.shape[1], buf.shape[0],
                                   QtGui.QImage.Format_ARGB32_Premultiplied)
-            _setDevicePixelRatioF(qimage, self._dpi_ratio)
+            _setDevicePixelRatio(qimage, self._dpi_ratio)
             # set origin using original QT coordinates
             origin = QtCore.QPoint(rect.left(), rect.top())
             painter.drawImage(origin, qimage)
diff --git a/lib/matplotlib/backends/backend_qt5cairo.py b/lib/matplotlib/backends/backend_qt5cairo.py
index d29997410323..c79b0bc22260 100644
--- a/lib/matplotlib/backends/backend_qt5cairo.py
+++ b/lib/matplotlib/backends/backend_qt5cairo.py
@@ -2,7 +2,7 @@
 
 from .backend_cairo import cairo, FigureCanvasCairo, RendererCairo
 from .backend_qt5 import QtCore, QtGui, _BackendQT5, FigureCanvasQT
-from .qt_compat import QT_API, _setDevicePixelRatioF
+from .qt_compat import QT_API, _setDevicePixelRatio
 
 
 class FigureCanvasQTCairo(FigureCanvasQT, FigureCanvasCairo):
@@ -33,7 +33,7 @@ def paintEvent(self, event):
         # QImage under PySide on Python 3.
         if QT_API == 'PySide':
             ctypes.c_long.from_address(id(buf)).value = 1
-        _setDevicePixelRatioF(qimage, dpi_ratio)
+        _setDevicePixelRatio(qimage, dpi_ratio)
         painter = QtGui.QPainter(self)
         painter.eraseRect(event.rect())
         painter.drawImage(0, 0, qimage)
diff --git a/lib/matplotlib/backends/qt_compat.py b/lib/matplotlib/backends/qt_compat.py
index e2c6e1f44215..4068afb5aaf3 100644
--- a/lib/matplotlib/backends/qt_compat.py
+++ b/lib/matplotlib/backends/qt_compat.py
@@ -206,15 +206,12 @@ def _devicePixelRatioF(obj):
         return 1
 
 
-def _setDevicePixelRatioF(obj, val):
+def _setDevicePixelRatio(obj, val):
     """
-    Call obj.setDevicePixelRatioF(val) with graceful fallback for older Qt.
+    Call obj.setDevicePixelRatio(val) with graceful fallback for older Qt.
 
     This can be replaced by the direct call when we require Qt>=5.6.
     """
-    if hasattr(obj, 'setDevicePixelRatioF'):
-        # Not available on Qt<5.6
-        obj.setDevicePixelRatioF(val)
-    elif hasattr(obj, 'setDevicePixelRatio'):
+    if hasattr(obj, 'setDevicePixelRatio'):
         # Not available on Qt4 or some older Qt5.
         obj.setDevicePixelRatio(val)