diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb914fb..ce96222 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
 ### Fixed
 
 - Fix `calc_hashsums` info option name.
+- Fix enabling `use_s3_urls` or `use_gcs_urls` without using S3 or GCS service
 
 ## [3.0.0] - 2023-12-28
 
diff --git a/lib/imgproxy/url_adapters/active_storage.rb b/lib/imgproxy/url_adapters/active_storage.rb
index ffc2724..b6ff53b 100644
--- a/lib/imgproxy/url_adapters/active_storage.rb
+++ b/lib/imgproxy/url_adapters/active_storage.rb
@@ -30,6 +30,8 @@ def s3_url(image)
       end
 
       def use_s3_url(image)
+        return unless defined?(::ActiveStorage::Service::S3Service)
+
         config.use_s3_urls && service(image).is_a?(::ActiveStorage::Service::S3Service)
       end
 
@@ -38,6 +40,8 @@ def gcs_url(image)
       end
 
       def use_gcs_url(image)
+        return unless defined?(::ActiveStorage::Service::GCSService)
+
         config.use_gcs_urls && service(image).is_a?(::ActiveStorage::Service::GCSService)
       end
 
diff --git a/spec/url_adapters/active_storage_spec.rb b/spec/url_adapters/active_storage_spec.rb
index c06a371..c9620cb 100644
--- a/spec/url_adapters/active_storage_spec.rb
+++ b/spec/url_adapters/active_storage_spec.rb
@@ -93,6 +93,15 @@
       end
     end
 
+    context 'with non-S3 service' do
+      let(:active_storage_service_name) { :local }
+
+      it 'builds http URL' do
+        expect(Imgproxy.url_for(user.avatar)).to end_with \
+          "/plain/#{Rails.application.routes.url_helpers.url_for(user.avatar)}"
+      end
+    end
+
     describe "extension" do
       it "builds URL with ActiveStorage extension" do
         expect(user.avatar.imgproxy_url(width: 200)).to eq(
@@ -134,6 +143,15 @@
       end
     end
 
+    context 'with non-GCS service' do
+      let(:active_storage_service_name) { :local }
+
+      it 'builds http URL' do
+        expect(Imgproxy.url_for(user.avatar)).to end_with \
+          "/plain/#{Rails.application.routes.url_helpers.url_for(user.avatar)}"
+      end
+    end
+
     describe "extension" do
       it "build URL with ActiveStorage extension" do
         expect(user.avatar.imgproxy_url(width: 200)).to eq(