diff --git a/lib/runner/strategy/poseidon.rb b/lib/runner/strategy/poseidon.rb
index 477ae0f1..e6d68de7 100644
--- a/lib/runner/strategy/poseidon.rb
+++ b/lib/runner/strategy/poseidon.rb
@@ -120,8 +120,7 @@ class Runner::Strategy::Poseidon < Runner::Strategy
 
     # First, clean the workspace and second, copy all files to their location.
     # This ensures that no artifacts from a previous submission remain in the workspace.
-    # TODO: Switch back to clean diretory content only. See https://github.com/openHPI/poseidon/issues/42
-    body = {copy: copy, delete: ['/workspace']}
+    body = {copy: copy, delete: ['./*']}
     response = self.class.http_connection.patch url, body.to_json
     return if response.status == 204
 
diff --git a/spec/lib/runner/strategy/poseidon_spec.rb b/spec/lib/runner/strategy/poseidon_spec.rb
index c4806587..73259815 100644
--- a/spec/lib/runner/strategy/poseidon_spec.rb
+++ b/spec/lib/runner/strategy/poseidon_spec.rb
@@ -328,7 +328,7 @@ describe Runner::Strategy::Poseidon do
       WebMock
         .stub_request(:patch, "#{described_class.config[:url]}/runners/#{runner_id}/files")
         .with(
-          body: {copy: [{path: file.filepath, content: encoded_file_content}], delete: ['/workspace']},
+          body: {copy: [{path: file.filepath, content: encoded_file_content}], delete: ['./*']},
           headers: {'Content-Type' => 'application/json'}
         )
         .to_return(body: response_body, status: response_status)