diff --git a/activemodel/lib/active_model/type/integer.rb b/activemodel/lib/active_model/type/integer.rb
index 5878b9417175d..1ff232a977d0c 100644
--- a/activemodel/lib/active_model/type/integer.rb
+++ b/activemodel/lib/active_model/type/integer.rb
@@ -18,11 +18,6 @@ def type
         :integer
       end
 
-      def deserialize(value)
-        return if value.nil?
-        value.to_i
-      end
-
       def serialize(value)
         result = super
         if result
diff --git a/activemodel/test/cases/type/integer_test.rb b/activemodel/test/cases/type/integer_test.rb
index 9bd0110099915..dec188b4cca40 100644
--- a/activemodel/test/cases/type/integer_test.rb
+++ b/activemodel/test/cases/type/integer_test.rb
@@ -54,7 +54,7 @@ class IntegerTest < ActiveModel::TestCase
         type = Type::Integer.new
         assert_nil type.cast("")
         assert_nil type.serialize("")
-        assert_equal 0, type.deserialize("")
+        assert_nil type.deserialize("")
       end
 
       test "changed?" do