diff --git a/lib/prometheus_exporter/client.rb b/lib/prometheus_exporter/client.rb
index d14f835..1250794 100644
--- a/lib/prometheus_exporter/client.rb
+++ b/lib/prometheus_exporter/client.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require_relative "../prometheus_exporter"
 require "socket"
 require "logger"
 
diff --git a/lib/prometheus_exporter/server.rb b/lib/prometheus_exporter/server.rb
index 944c8f0..08f9b27 100644
--- a/lib/prometheus_exporter/server.rb
+++ b/lib/prometheus_exporter/server.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require_relative "../prometheus_exporter"
 require_relative "metric"
 require_relative "server/type_collector"
 require_relative "server/web_collector"
diff --git a/test/client_independent_loading_test.rb b/test/client_independent_loading_test.rb
new file mode 100644
index 0000000..026c8bd
--- /dev/null
+++ b/test/client_independent_loading_test.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+# This test verifies that the client can be loaded independently
+# without requiring the main prometheus_exporter module first.
+#
+# DO NOT require test_helper here, as it pre-loads the main module.
+
+require "minitest/autorun"
+
+class ClientIndependentLoadingTest < Minitest::Test
+  def test_client_has_constants_when_loaded_independently
+    require_relative "../lib/prometheus_exporter/client"
+
+    assert_equal 9394, PrometheusExporter::DEFAULT_PORT
+    assert_equal "localhost", PrometheusExporter::DEFAULT_BIND_ADDRESS
+    assert_equal 2, PrometheusExporter::DEFAULT_TIMEOUT
+  end
+end
diff --git a/test/server_independent_loading_test.rb b/test/server_independent_loading_test.rb
new file mode 100644
index 0000000..03378d2
--- /dev/null
+++ b/test/server_independent_loading_test.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# This test verifies that the server can be loaded independently
+# without requiring the main prometheus_exporter module first.
+#
+# DO NOT require test_helper here, as it pre-loads the main module.
+
+require "minitest/autorun"
+
+class ServerIndependentLoadingTest < Minitest::Test
+  def test_server_has_constants_when_loaded_independently
+    require_relative "../lib/prometheus_exporter/server"
+
+    assert_equal 9394, PrometheusExporter::DEFAULT_PORT
+    assert_equal "localhost", PrometheusExporter::DEFAULT_BIND_ADDRESS
+    assert_equal 2, PrometheusExporter::DEFAULT_TIMEOUT
+    assert_equal "ruby_", PrometheusExporter::DEFAULT_PREFIX
+    assert_equal "Prometheus Exporter", PrometheusExporter::DEFAULT_REALM
+  end
+end