diff --git a/fastlane/Fastfile b/fastlane/Fastfile
index 9a6caec..8810cba 100644
--- a/fastlane/Fastfile
+++ b/fastlane/Fastfile
@@ -29,6 +29,24 @@ lane :test_release_notes do
   )
 end
 
+lane :test_group_names do
+  appcenter_upload(
+    api_token: ENV["TEST_APPCENTER_API_TOKEN"],
+    owner_name: ENV["TEST_APPCENTER_OWNER_NAME"],
+    app_name: "MyApplication",
+    apk: "./fastlane/app-release.apk",
+    group: "Group%20with%20space"
+  )
+
+  appcenter_upload(
+    api_token: ENV["TEST_APPCENTER_API_TOKEN"],
+    owner_name: ENV["TEST_APPCENTER_OWNER_NAME"],
+    app_name: "MyApplication",
+    apk: "./fastlane/app-release.apk",
+    group: "Group with space"
+  )
+end
+
 lane :test do
   # appcenter_upload will read release_notes from FL_CHANGELOG
   Actions.lane_context[SharedValues::FL_CHANGELOG] = 'shared changelog'
diff --git a/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb b/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb
index c1960f2..82e7914 100644
--- a/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb
+++ b/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb
@@ -219,7 +219,7 @@ def self.get_group(api_token, owner_name, app_name, group_name)
         connection = self.connection
 
         response = connection.get do |req|
-          req.url("/v0.1/apps/#{owner_name}/#{app_name}/distribution_groups/#{group_name}")
+          req.url("/v0.1/apps/#{owner_name}/#{app_name}/distribution_groups/#{ERB::Util.url_encode(group_name)}")
           req.headers['X-API-Token'] = api_token
           req.headers['internal-request-source'] = "fastlane"
         end
diff --git a/spec/appcenter_upload_spec.rb b/spec/appcenter_upload_spec.rb
index fb3a966..f470476 100644
--- a/spec/appcenter_upload_spec.rb
+++ b/spec/appcenter_upload_spec.rb
@@ -521,7 +521,6 @@ def stub_add_to_group(status, mandatory_update = false, notify_testers = false)
       end").runner.execute(:test)
     end
 
-
     it "uses proper api for mandatory release with email notification parameter" do
       stub_check_app(200)
       stub_create_release_upload(200)
@@ -578,6 +577,35 @@ def stub_add_to_group(status, mandatory_update = false, notify_testers = false)
       end").runner.execute(:test)
     end
 
+    it "encodes group names" do
+      stub_check_app(200)
+      stub_create_release_upload(200)
+      stub_upload_build(200)
+      stub_update_release_upload(200, 'committed')
+      stub_update_release(200)      
+      stub_get_group(200, 'Testers%201')
+      stub_get_group(200, 'Testers%202')
+      stub_get_group(200, 'Testers%203')
+      stub_add_to_group(200)
+      stub_add_to_group(200)
+      stub_add_to_group(200)
+      stub_get_release(200)
+      stub_create_dsym_upload(200)
+      stub_upload_dsym(200)
+      stub_update_dsym_upload(200, "committed")
+
+      Fastlane::FastFile.new.parse("lane :test do
+        appcenter_upload({
+          api_token: 'xxx',
+          owner_name: 'owner',
+          app_name: 'app',
+          ipa: './spec/fixtures/appfiles/ipa_file_empty.ipa',
+          dsym: './spec/fixtures/symbols/Themoji.dSYM.zip',
+          group: 'Testers 1,Testers 2,Testers 3'
+        })
+      end").runner.execute(:test)
+    end
+
     it "creates app if it was not found" do
       stub_check_app(404)
       stub_create_app(200)