diff --git a/sdks/python/apache_beam/coders/coders.py b/sdks/python/apache_beam/coders/coders.py
index ddcb80630487..b1c607457f9f 100644
--- a/sdks/python/apache_beam/coders/coders.py
+++ b/sdks/python/apache_beam/coders/coders.py
@@ -1512,7 +1512,7 @@ def _create_impl(self):
 
   def is_deterministic(self) -> bool:
     return (
-        all(c.is_deterministic for _, c in self._coder_types) and (
+        all(c.is_deterministic() for _, c in self._coder_types) and (
             self._fallback_coder is None or
             self._fallback_coder.is_deterministic()))
 
diff --git a/sdks/python/apache_beam/coders/coders_test_common.py b/sdks/python/apache_beam/coders/coders_test_common.py
index fcc5e6ac58bf..ad742665fb8a 100644
--- a/sdks/python/apache_beam/coders/coders_test_common.py
+++ b/sdks/python/apache_beam/coders/coders_test_common.py
@@ -1082,6 +1082,20 @@ def test_OrderedUnionCoder(self):
     self.check_coder(test_coder, 123)
     self.check_coder(test_coder, 1.5)
 
+  def test_OrderedUnionCoderDeterministic(self):
+    # CustomCoder is not deterministic therefore test_coder is not
+    # deterministic
+    test_coder = coders._OrderedUnionCoder((str, coders.StrUtf8Coder()),
+                                           (int, CustomCoder()),
+                                           fallback_coder=coders.FloatCoder())
+
+    self.assertFalse(test_coder.is_deterministic())
+
+    test_coder = coders._OrderedUnionCoder((str, coders.StrUtf8Coder()),
+                                           (int, coders.VarIntCoder()),
+                                           fallback_coder=coders.FloatCoder())
+    self.assertTrue(test_coder.is_deterministic())
+
 
 if __name__ == '__main__':
   logging.getLogger().setLevel(logging.INFO)