diff --git a/lib/faraday/options/proxy_options.rb b/lib/faraday/options/proxy_options.rb
index 8d8b0238..028f3d2a 100644
--- a/lib/faraday/options/proxy_options.rb
+++ b/lib/faraday/options/proxy_options.rb
@@ -22,8 +22,10 @@ module Faraday
       when URI
         value = { uri: value }
       when Hash, Options
-        if (uri = value.delete(:uri))
-          value[:uri] = Utils.URI(uri)
+        if value[:uri]
+          value = value.dup.tap do |duped|
+            duped[:uri] = Utils.URI(duped[:uri])
+          end
         end
       end
 
diff --git a/spec/faraday/options/proxy_options_spec.rb b/spec/faraday/options/proxy_options_spec.rb
index 749247d1..15203edb 100644
--- a/spec/faraday/options/proxy_options_spec.rb
+++ b/spec/faraday/options/proxy_options_spec.rb
@@ -27,6 +27,33 @@ RSpec.describe Faraday::ProxyOptions do
       expect(options.inspect).to eq('#<Faraday::ProxyOptions (empty)>')
     end
 
+    it 'works with hash' do
+      hash = { user: 'user', password: 'pass', uri: 'http://@example.org' }
+      options = Faraday::ProxyOptions.from(hash)
+      expect(options.user).to eq('user')
+      expect(options.password).to eq('pass')
+      expect(options.uri).to be_a_kind_of(URI)
+      expect(options.path).to eq('')
+      expect(options.port).to eq(80)
+      expect(options.host).to eq('example.org')
+      expect(options.scheme).to eq('http')
+      expect(options.inspect).to match('#<Faraday::ProxyOptions uri=')
+    end
+
+    it 'works with option' do
+      opt_arg = { user: 'user', password: 'pass', uri: 'http://@example.org' }
+      option = Faraday::ConnectionOptions.from(proxy: opt_arg)
+      options = Faraday::ProxyOptions.from(option.proxy)
+      expect(options.user).to eq('user')
+      expect(options.password).to eq('pass')
+      expect(options.uri).to be_a_kind_of(URI)
+      expect(options.path).to eq('')
+      expect(options.port).to eq(80)
+      expect(options.host).to eq('example.org')
+      expect(options.scheme).to eq('http')
+      expect(options.inspect).to match('#<Faraday::ProxyOptions uri=')
+    end
+
     it 'works with no auth' do
       proxy = Faraday::ProxyOptions.from 'http://example.org'
       expect(proxy.user).to be_nil