diff --git a/Lib/test/test_cmath.py b/Lib/test/test_cmath.py
index a589f8db7ea..a8033635ecd 100644
--- a/Lib/test/test_cmath.py
+++ b/Lib/test/test_cmath.py
@@ -448,7 +448,7 @@ def test_isfinite(self):
         for x in real_vals:
             for y in real_vals:
                 z = complex(x, y)
-                self.assertEquals(cmath.isfinite(z),
+                self.assertEqual(cmath.isfinite(z),
                                   math.isfinite(x) and math.isfinite(y))
 
     def test_isnan(self):