diff --git a/runtype/base_types.py b/runtype/base_types.py
index 7cc3d10..902d88f 100644
--- a/runtype/base_types.py
+++ b/runtype/base_types.py
@@ -157,6 +157,12 @@ def __le__(self, other):
 
         return NotImplemented
 
+    def __ge__(self, other):
+        if isinstance(other, DataType):
+            return False
+
+        return NotImplemented
+
 
 class ContainerType(DataType):
     """Base class for containers, such as generics.
diff --git a/tests/test_basic.py b/tests/test_basic.py
index 06222c2..b93f1ff 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -70,6 +70,7 @@ def test_basic(self):
 
         assert isa((3,), (Tuple[int], list))
         assert not isa([40, 2], Tuple[int, int])
+        assert not issubclass(float, typing.Tuple[float, float])
 
         # Mappings
         assert issubclass(dict, abc.Mapping)