diff --git a/Lib/test/test_cmath.py b/Lib/test/test_cmath.py
index a96a5780b31b6f..389a3fa0e0a1eb 100644
--- a/Lib/test/test_cmath.py
+++ b/Lib/test/test_cmath.py
@@ -406,6 +406,8 @@ def polar_with_errno_set(z):
                 _testcapi.set_errno(0)
         self.check_polar(polar_with_errno_set)
 
+    @unittest.skipIf(sys.platform.startswith("sunos"),
+                     "skipping, see gh-138573")
     def test_phase(self):
         self.assertAlmostEqual(phase(0), 0.)
         self.assertAlmostEqual(phase(1.), 0.)
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
index 68f41a2e62034d..8f9a239bead130 100644
--- a/Lib/test/test_math.py
+++ b/Lib/test/test_math.py
@@ -291,6 +291,8 @@ def testAtanh(self):
         self.assertRaises(ValueError, math.atanh, NINF)
         self.assertTrue(math.isnan(math.atanh(NAN)))
 
+    @unittest.skipIf(sys.platform.startswith("sunos"),
+                     "skipping, see gh-138573")
     def testAtan2(self):
         self.assertRaises(TypeError, math.atan2)
         self.ftest('atan2(-1, 0)', math.atan2(-1, 0), -math.pi/2)