diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee481d96..f9a58835 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@
 
 #### Fixes
 
+* [#580](https://github.com/ruby-grape/grape-swagger/pull/580): Issue #578: fixes duplicated path params - [@LeFnord](https://github.com/LeFnord).
+
 * Your contribution here.
 
 ### 0.26.1 (February 3, 2014)
diff --git a/lib/grape-swagger/endpoint.rb b/lib/grape-swagger/endpoint.rb
index ab8578e1..1a99d872 100644
--- a/lib/grape-swagger/endpoint.rb
+++ b/lib/grape-swagger/endpoint.rb
@@ -237,21 +237,21 @@ def tag_object(route)
 
     def partition_params(route)
       declared_params = route.settings[:declared_params] if route.settings[:declared_params].present?
-      required, exposed = route.params.partition { |x| x.first.is_a? String }
+      required = merge_params(route)
       required = GrapeSwagger::DocMethods::Headers.parse(route) + required unless route.headers.nil?
 
       default_type(required)
-      default_type(exposed)
 
       request_params = unless declared_params.nil? && route.headers.nil?
                          parse_request_params(required)
                        end || {}
 
-      if route.params.present? && !route.settings[:declared_params].present?
-        request_params = route.params.merge(request_params)
-      end
+      request_params.empty? ? required : request_params
+    end
 
-      request_params
+    def merge_params(route)
+      param_keys = route.params.keys
+      route.params.delete_if { |key| key.is_a?(String) && param_keys.include?(key.to_sym) }.to_a
     end
 
     def default_type(params)
diff --git a/spec/issues/532_allow_custom_format_spec.rb b/spec/issues/532_allow_custom_format_spec.rb
index 9756809f..0a37e7ab 100644
--- a/spec/issues/532_allow_custom_format_spec.rb
+++ b/spec/issues/532_allow_custom_format_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe '#542 array of type in post params' do
+describe '#532 allow custom format' do
   let(:app) do
     Class.new(Grape::API) do
       namespace :issue_532 do
diff --git a/spec/issues/537_enum_values_spec.rb b/spec/issues/537_enum_values_spec.rb
index 920c09e0..97227ca0 100644
--- a/spec/issues/537_enum_values_spec.rb
+++ b/spec/issues/537_enum_values_spec.rb
@@ -3,7 +3,7 @@
 describe '#537 enum values spec' do
   let(:app) do
     Class.new(Grape::API) do
-      namespace :issue_539 do
+      namespace :issue_537 do
         class Spec < Grape::Entity
           expose :enum_property, documentation: { values: [:foo, :bar] }
           expose :enum_property_default, documentation: { values: %w(a b c), default: 'c' }
diff --git a/spec/issues/579_align_put_post_parameters_spec.rb b/spec/issues/579_align_put_post_parameters_spec.rb
new file mode 100644
index 00000000..ac519a7b
--- /dev/null
+++ b/spec/issues/579_align_put_post_parameters_spec.rb
@@ -0,0 +1,177 @@
+require 'spec_helper'
+
+describe '#579 put / post parameters spec' do
+  let(:app) do
+    Class.new(Grape::API) do
+      namespace :issue_579 do
+        class BodySpec < Grape::Entity
+          expose :guid, documentation: { type: String, format: 'guid', in: 'body' }
+          expose :name, documentation: { type: String, in: 'body' }
+          expose :content, documentation: { type: String, in: 'body' }
+        end
+
+        class Spec < Grape::Entity
+          expose :guid, documentation: { type: String, format: 'guid' }
+          expose :name, documentation: { type: String }
+          expose :content, documentation: { type: String }
+        end
+
+        namespace :implicit do
+          namespace :body_parameter do
+            desc 'update spec',
+                 success: BodySpec,
+                 params: BodySpec.documentation
+            put ':guid' do
+              # your code goes here
+            end
+          end
+
+          namespace :form_parameter do
+            desc 'update spec',
+                 success: Spec,
+                 params: Spec.documentation
+            put ':guid' do
+              # your code goes here
+            end
+          end
+        end
+
+        namespace :explicit do
+          namespace :body_parameter do
+            desc 'update spec',
+                 success: BodySpec,
+                 params: BodySpec.documentation
+            params do
+              requires :guid
+            end
+            put ':guid' do
+              # your code goes here
+            end
+          end
+
+          namespace :form_parameter do
+            desc 'update spec',
+                 success: Spec,
+                 params: Spec.documentation
+            params do
+              requires :guid
+            end
+            put ':guid' do
+              # your code goes here
+            end
+          end
+        end
+
+        namespace :namespace_param do
+          route_param :guid do
+            namespace :body_parameter do
+              desc 'update spec',
+                   success: BodySpec,
+                   params: BodySpec.documentation
+              put do
+                # your code goes here
+              end
+            end
+
+            namespace :form_parameter do
+              desc 'update spec',
+                   success: Spec,
+                   params: Spec.documentation
+              put do
+                # your code goes here
+              end
+            end
+          end
+        end
+      end
+
+      add_swagger_documentation format: :json
+    end
+  end
+
+  subject do
+    get '/swagger_doc'
+    JSON.parse(last_response.body)
+  end
+
+  describe 'implicit path param given' do
+    let(:body_parameters) { subject['paths']['/issue_579/implicit/body_parameter/{guid}']['put']['parameters'] }
+    specify do
+      expect(body_parameters).to eql(
+        [
+          { 'in' => 'path', 'name' => 'guid', 'type' => 'string', 'format' => 'guid', 'required' => true },
+          {
+            'name' => 'Issue579ImplicitBodyParameter', 'in' => 'body', 'required' => true, 'schema' => {
+              '$ref' => '#/definitions/putIssue579ImplicitBodyParameter'
+            }
+          }
+        ]
+      )
+    end
+
+    let(:form_parameters) { subject['paths']['/issue_579/implicit/form_parameter/{guid}']['put']['parameters'] }
+    specify do
+      expect(form_parameters).to eql(
+        [
+          { 'in' => 'path', 'name' => 'guid', 'type' => 'string', 'format' => 'guid', 'required' => true },
+          { 'in' => 'formData', 'name' => 'name', 'type' => 'string', 'required' => false },
+          { 'in' => 'formData', 'name' => 'content', 'type' => 'string', 'required' => false }
+        ]
+      )
+    end
+  end
+
+  describe 'explicit path param given' do
+    let(:body_parameters) { subject['paths']['/issue_579/explicit/body_parameter/{guid}']['put']['parameters'] }
+    specify do
+      expect(body_parameters).to eql(
+        [
+          { 'in' => 'path', 'name' => 'guid', 'type' => 'string', 'format' => 'guid', 'required' => true },
+          {
+            'name' => 'Issue579ExplicitBodyParameter', 'in' => 'body', 'required' => true, 'schema' => {
+              '$ref' => '#/definitions/putIssue579ExplicitBodyParameter'
+            }
+          }
+        ]
+      )
+    end
+
+    let(:form_parameters) { subject['paths']['/issue_579/explicit/form_parameter/{guid}']['put']['parameters'] }
+    specify do
+      expect(form_parameters).to eql(
+        [
+          { 'in' => 'path', 'name' => 'guid', 'type' => 'string', 'format' => 'guid', 'required' => true },
+          { 'in' => 'formData', 'name' => 'name', 'type' => 'string', 'required' => false },
+          { 'in' => 'formData', 'name' => 'content', 'type' => 'string', 'required' => false }
+        ]
+      )
+    end
+  end
+
+  describe 'explicit as route param given' do
+    let(:body_parameters) { subject['paths']['/issue_579/namespace_param/{guid}/body_parameter']['put']['parameters'] }
+    specify do
+      expect(body_parameters).to eql(
+        [
+          { 'in' => 'path', 'name' => 'guid', 'type' => 'string', 'format' => 'guid', 'required' => true },
+          {
+            'name' => 'Issue579NamespaceParamGuidBodyParameter', 'in' => 'body', 'required' => true, 'schema' => {
+              '$ref' => '#/definitions/putIssue579NamespaceParamGuidBodyParameter'
+            }
+          }
+        ]
+      )
+    end
+
+    let(:form_parameters) { subject['paths']['/issue_579/namespace_param/{guid}/form_parameter']['put']['parameters'] }
+    specify do
+      expect(form_parameters).to eql(
+        [
+          { 'in' => 'path', 'name' => 'guid', 'type' => 'string', 'format' => 'guid', 'required' => true },
+          { 'in' => 'formData', 'name' => 'name', 'type' => 'string', 'required' => false },
+          { 'in' => 'formData', 'name' => 'content', 'type' => 'string', 'required' => false }
+        ]
+      )
+    end
+  end
+end