diff --git a/lib/rack_reverse_proxy/rule.rb b/lib/rack_reverse_proxy/rule.rb
index 0635482..4916909 100644
--- a/lib/rack_reverse_proxy/rule.rb
+++ b/lib/rack_reverse_proxy/rule.rb
@@ -93,11 +93,11 @@ def raw_uri
       end
 
       def just_uri
-        URI.parse(url)
+        Addressable::URI.parse(url)
       end
 
       def uri_with_path
-        URI.join(url, path)
+        Addressable::URI.join(url, path)
       end
 
       def evaluate(url)
@@ -115,7 +115,7 @@ def with_substitutions?
       end
 
       def substitute_matches
-        URI(matches.substitute(url))
+        Addressable::URI.parse(matches.substitute(url))
       end
     end
 
diff --git a/spec/rack_reverse_proxy/rule_spec.rb b/spec/rack_reverse_proxy/rule_spec.rb
new file mode 100644
index 0000000..1e458cb
--- /dev/null
+++ b/spec/rack_reverse_proxy/rule_spec.rb
@@ -0,0 +1,39 @@
+require "spec_helper"
+
+module RackReverseProxy
+  RSpec.describe Rule do
+    describe '#get_uri' do
+      context 'with path' do
+        it 'accepts URLs with square brackets' do
+          rule = RackReverseProxy::Rule.new('/test', 'http://example.com')
+
+          uri = rule.get_uri('/test/[id]', {}, nil, nil)
+
+          expect(uri.to_s).to eq 'http://example.com/test/[id]'
+        end
+      end
+
+      context 'with substitutions' do
+        it 'accepts URLs with square brackets' do
+          rule = RackReverseProxy::Rule.new(%r{^/test/(.*)}, 'http://example.com/test/$1')
+
+          uri = rule.get_uri('/test/[id]', {}, nil, nil)
+
+          expect(uri.to_s).to eq 'http://example.com/test/[id]'
+        end
+      end
+
+      context 'with custom url' do
+        it 'accepts URLs with square brackets' do
+          rule = RackReverseProxy::Rule.new(%r{^/test/(.*)})
+
+          expect_any_instance_of(RackReverseProxy::Rule::Matches).to receive(:custom_url).and_return('/test/[id]')
+
+          uri = rule.get_uri('/test/[id]', {}, nil, nil)
+
+          expect(uri.to_s).to eq '/test/[id]'
+        end
+      end
+    end
+  end
+end