diff --git a/lollipop/types.py b/lollipop/types.py
index 21d6959..781b2d7 100644
--- a/lollipop/types.py
+++ b/lollipop/types.py
@@ -164,6 +164,11 @@ class Any(Type):
 class Number(Type):
     """Any number type (integer/float).
 
+    :param bool strict: If True, it will allow to perform type casting
+        from string representation to numeric. If False, it will raise
+        :exc:`~lollipop.errors.ValidationError` for strint input during
+        deserialization.
+
     Error message keys:
         * invalid - invalid value type. Interpolation data:
                 * data - actual value
@@ -173,6 +178,10 @@ class Number(Type):
         'invalid': 'Value should be number',
     }
 
+    def __init__(self, strict=True, *args, **kwargs):
+        super(Number, self).__init__(**kwargs)
+        self.strict = strict
+
     def _normalize(self, value):
         try:
             return self.num_type(value)
@@ -183,7 +192,7 @@ def load(self, data, *args, **kwargs):
         if data is MISSING or data is None:
             self._fail('required')
 
-        if isinstance(data, string_types):
+        if self.strict and isinstance(data, string_types):
             self._fail('invalid')
 
         return super(Number, self).load(self._normalize(data), *args, **kwargs)
diff --git a/tests/test_types.py b/tests/test_types.py
index a33b131..1fe7192 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -214,6 +214,9 @@ def test_loading_integer(self):
     def test_loading_float_value(self):
         assert Number().load(1.23) == 1.23
 
+    def test_loading_non_strict_integer(self):
+        assert Number(strict=False).load("123") == 123
+
     def test_loading_numeric_as_string(self):
         with pytest.raises(ValidationError) as exc_info:
             Number().load("123")