diff --git a/modules/openapi-generator/src/main/resources/ruby-client/api_client_spec.mustache b/modules/openapi-generator/src/main/resources/ruby-client/api_client_spec.mustache
index 3e8d070ef9f7..364c60419c4f 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/api_client_spec.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/api_client_spec.mustache
@@ -150,7 +150,7 @@ describe {{moduleName}}::ApiClient do
     end
 
     it 'fails for invalid collection format' do
-      expect(proc { api_client.build_collection_param(param, :INVALID) }).to raise_error(RuntimeError, 'unknown collection format: :INVALID')
+      expect{api_client.build_collection_param(param, :INVALID)}.to raise_error(RuntimeError, 'unknown collection format: :INVALID')
     end
   end
 
diff --git a/samples/client/petstore/ruby/spec/api_client_spec.rb b/samples/client/petstore/ruby/spec/api_client_spec.rb
index aea4c5f46c9d..34fdb55221e7 100644
--- a/samples/client/petstore/ruby/spec/api_client_spec.rb
+++ b/samples/client/petstore/ruby/spec/api_client_spec.rb
@@ -156,7 +156,7 @@ describe Petstore::ApiClient do
     end
 
     it 'fails for invalid collection format' do
-      expect(proc { api_client.build_collection_param(param, :INVALID) }).to raise_error(RuntimeError, 'unknown collection format: :INVALID')
+      expect{api_client.build_collection_param(param, :INVALID)}.to raise_error(RuntimeError, 'unknown collection format: :INVALID')
     end
   end
 
diff --git a/samples/openapi3/client/petstore/ruby-faraday/spec/api_client_spec.rb b/samples/openapi3/client/petstore/ruby-faraday/spec/api_client_spec.rb
index 4a65cbd55a4b..824f318c247b 100644
--- a/samples/openapi3/client/petstore/ruby-faraday/spec/api_client_spec.rb
+++ b/samples/openapi3/client/petstore/ruby-faraday/spec/api_client_spec.rb
@@ -118,7 +118,7 @@ describe Petstore::ApiClient do
     end
 
     it 'fails for invalid collection format' do
-      expect(proc { api_client.build_collection_param(param, :INVALID) }).to raise_error(RuntimeError, 'unknown collection format: :INVALID')
+      expect{api_client.build_collection_param(param, :INVALID)}.to raise_error(RuntimeError, 'unknown collection format: :INVALID')
     end
   end
 
diff --git a/samples/openapi3/client/petstore/ruby/spec/api_client_spec.rb b/samples/openapi3/client/petstore/ruby/spec/api_client_spec.rb
index aea4c5f46c9d..34fdb55221e7 100644
--- a/samples/openapi3/client/petstore/ruby/spec/api_client_spec.rb
+++ b/samples/openapi3/client/petstore/ruby/spec/api_client_spec.rb
@@ -156,7 +156,7 @@ describe Petstore::ApiClient do
     end
 
     it 'fails for invalid collection format' do
-      expect(proc { api_client.build_collection_param(param, :INVALID) }).to raise_error(RuntimeError, 'unknown collection format: :INVALID')
+      expect{api_client.build_collection_param(param, :INVALID)}.to raise_error(RuntimeError, 'unknown collection format: :INVALID')
     end
   end