diff --git a/Orange/widgets/visualize/utils/plotutils.py b/Orange/widgets/visualize/utils/plotutils.py
index 076ae93282c..3dab7cdf98a 100644
--- a/Orange/widgets/visualize/utils/plotutils.py
+++ b/Orange/widgets/visualize/utils/plotutils.py
@@ -614,6 +614,14 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.label.setDefaultTextColor(self.palette().color(QPalette.Text))
 
+    def getSIPrefixEnableRanges(self):
+        # Since pyqtgraph 0.14, axes without units also get an SI prefix for
+        # values below 1 (e.g. "(x0.001)"). Keep the behaviour of pyqtgraph
+        # 0.13 (which does not call this method): no prefix from 1e-3 to 1e6.
+        if self.labelUnits == "":
+            return (0, 1e-3), (1e6, np.inf)
+        return super().getSIPrefixEnableRanges()
+
     def changeEvent(self, event: QEvent) -> None:
         if event.type() == QEvent.FontChange:
             self.picture = None
diff --git a/Orange/widgets/visualize/utils/tests/test_plotutils.py b/Orange/widgets/visualize/utils/tests/test_plotutils.py
index 51cb8786b24..201299e707e 100644
--- a/Orange/widgets/visualize/utils/tests/test_plotutils.py
+++ b/Orange/widgets/visualize/utils/tests/test_plotutils.py
@@ -4,7 +4,11 @@
 import numpy as np
 from AnyQt.QtCore import QPointF
 
-from Orange.widgets.visualize.utils.plotutils import InteractiveViewBox
+from orangewidget.tests.base import GuiTest
+
+from Orange.widgets.visualize.utils.plotutils import (
+    AxisItem, InteractiveViewBox
+)
 
 
 class TestInteractiveViewBox(unittest.TestCase):
@@ -21,5 +25,27 @@ def test_update_scale_box(self):
             np.testing.assert_equal(trm, [[2, 0, 0], [0, 2, 0], [0, 0, 1]])
 
 
+class TestAxisItem(GuiTest):
+    def test_si_prefix_without_units(self):
+        axis = AxisItem("bottom")
+        axis.setLabel("a")
+
+        axis.setRange(0, 0.5)
+        self.assertEqual(axis.autoSIPrefixScale, 1)
+        axis.setRange(0, 5e5)
+        self.assertEqual(axis.autoSIPrefixScale, 1)
+
+        axis.setRange(0, 5e-4)
+        self.assertEqual(axis.autoSIPrefixScale, 1e6)
+        axis.setRange(0, 5e6)
+        self.assertEqual(axis.autoSIPrefixScale, 1e-6)
+
+    def test_si_prefix_with_units(self):
+        axis = AxisItem("bottom")
+        axis.setLabel("a", units="s")
+        axis.setRange(0, 0.5)
+        self.assertEqual(axis.autoSIPrefixScale, 1000)
+
+
 if __name__ == '__main__':
     unittest.main()