diff --git a/sumy/utils.py b/sumy/utils.py
index 7d0fc92..5eb8e32 100644
--- a/sumy/utils.py
+++ b/sumy/utils.py
@@ -97,7 +97,7 @@ def __call__(self, sequence):
         elif isinstance(self._value, (int, float)):
             return sequence[:int(self._value)]
         else:
-            ValueError("Unsuported value of items count '%s'." % self._value)
+            raise ValueError("Unsuported value of items count '%s'." % self._value)
 
     def __repr__(self):
         return to_string("<ItemsCount: %r>" % self._value)
diff --git a/tests/test_utils/test_utils.py b/tests/test_utils/test_utils.py
index 9cf1966..cd30ccc 100644
--- a/tests/test_utils/test_utils.py
+++ b/tests/test_utils/test_utils.py
@@ -56,6 +56,13 @@ def test_unsupported_items_count():
         count([])
 
 
+def test_items_count_with_unsupported_init_type():
+    count = ItemsCount([])
+
+    with pytest.raises(ValueError):
+        count([])
+
+
 def test_normalize_language_with_alpha_2_code():
     assert normalize_language("fr") == "french"
     assert normalize_language("zh") == "chinese"