diff --git a/lib/activerecord-import/import.rb b/lib/activerecord-import/import.rb
index be994d2e..ef2629e1 100644
--- a/lib/activerecord-import/import.rb
+++ b/lib/activerecord-import/import.rb
@@ -772,7 +772,9 @@ def values_sql_for_columns_and_attributes(columns, array_of_attributes) # :nodoc
               if serialized_attributes.include?(column.name)
                 val = serialized_attributes[column.name].dump(val)
               end
-              connection_memo.quote(column.type_cast(val), column)
+              # Fixes #443 to support binary (i.e. bytea) columns on PG
+              val = column.type_cast(val) unless column.type.to_sym == :binary
+              connection_memo.quote(val, column)
             end
           end
         end
diff --git a/test/schema/postgresql_schema.rb b/test/schema/postgresql_schema.rb
index 53dc7874..43b004ab 100644
--- a/test/schema/postgresql_schema.rb
+++ b/test/schema/postgresql_schema.rb
@@ -36,6 +36,7 @@
     t.column :alarm_type, :integer, null: false
     t.column :status, :integer, null: false
     t.column :metadata, :text
+    t.column :secret_key, :binary
     t.datetime :created_at
     t.datetime :updated_at
   end
diff --git a/test/support/postgresql/import_examples.rb b/test/support/postgresql/import_examples.rb
index 7c8a2c73..d1a20a8f 100644
--- a/test/support/postgresql/import_examples.rb
+++ b/test/support/postgresql/import_examples.rb
@@ -231,6 +231,17 @@ def should_support_postgresql_import_functionality
   end
 end
 
+describe "with binary field" do
+  let(:binary_value) { "\xE0'c\xB2\xB0\xB3Bh\\\xC2M\xB1m\\I\xC4r".force_encoding('ASCII-8BIT') }
+  it "imports the correct values for binary fields" do
+    alarms = [Alarm.new(device_id: 1, alarm_type: 1, status: 1, secret_key: binary_value)]
+    assert_difference "Alarm.count", +1 do
+      Alarm.import alarms
+    end
+    assert_equal(binary_value, Alarm.first.secret_key)
+  end
+end
+
 def should_support_postgresql_upsert_functionality
   should_support_basic_on_duplicate_key_update
   should_support_on_duplicate_key_ignore