diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 4f028d34ad..801067ee38 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -268,6 +268,7 @@ class Input(Widget):
 
     def __init__(self, attrs=None):
         if attrs is not None:
+            attrs = attrs.copy()
             self.input_type = attrs.pop('type', self.input_type)
         super(Input, self).__init__(attrs)
 
diff --git a/tests/forms_tests/widget_tests/test_input.py b/tests/forms_tests/widget_tests/test_input.py
new file mode 100644
index 0000000000..e773d94d8a
--- /dev/null
+++ b/tests/forms_tests/widget_tests/test_input.py
@@ -0,0 +1,15 @@
+from django.forms.widgets import Input
+
+from .base import WidgetTest
+
+
+class InputTests(WidgetTest):
+
+    def test_attrs_with_type(self):
+        attrs = {'type': 'date'}
+        widget = Input(attrs)
+        self.check_html(widget, 'name', 'value', '<input type="date" name="name" value="value" />')
+        # reuse the same attrs for another widget
+        self.check_html(Input(attrs), 'name', 'value', '<input type="date" name="name" value="value" />')
+        attrs['type'] = 'number'  # shouldn't change the widget type
+        self.check_html(widget, 'name', 'value', '<input type="date" name="name" value="value" />')