diff --git a/openapi3filter/issue267_test.go b/openapi3filter/issue267_test.go
new file mode 100644
index 000000000..f6ca00380
--- /dev/null
+++ b/openapi3filter/issue267_test.go
@@ -0,0 +1,156 @@
+package openapi3filter
+
+import (
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/getkin/kin-openapi/openapi3"
+	"github.com/getkin/kin-openapi/routers/gorillamux"
+)
+
+func TestIssue287(t *testing.T) {
+	spec := `
+openapi: 3.0.0
+info:
+  description: This is a sample of the API
+  version: 1.0.0
+  title: sample API
+tags:
+  - name: authorization
+    description: Create and validate authorization tokens using oauth
+paths:
+  /oauth2/token:
+    post:
+      tags:
+      - authorization
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/AccessTokenRequest'
+            examples:
+              ClientCredentialsTokenRequest:
+                $ref: '#/components/examples/ClientCredentialsTokenRequest'
+              RefreshTokenRequest:
+                $ref: '#/components/examples/RefreshTokenRequest'
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: '#/components/schemas/AccessTokenRequest'
+            examples:
+              ClientCredentialsTokenRequest:
+                $ref: '#/components/examples/ClientCredentialsTokenRequest'
+              RefreshTokenRequest:
+                $ref: '#/components/examples/RefreshTokenRequest'
+      responses:
+        '200':
+          description: 'The request was successful and a token was issued.'
+
+components:
+  examples:
+    ClientCredentialsTokenRequest:
+      value:
+        grant_type: client_credentials
+        scope: 'member:read member:write'
+    RefreshTokenRequest:
+      value:
+        grant_type: refresh_token
+        client_id: '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+        refresh_token: '2fbd6ad96acc4fa99ef36a3e803b010b'
+  schemas:
+    AccessTokenRequest:
+      description: 'Describes all of the potential access token requests that can be received'
+      type: object
+      oneOf:
+      - $ref: '#/components/schemas/ClientCredentialsTokenRequest'
+      - $ref: '#/components/schemas/RefreshTokenRequest'
+    ClientCredentialsTokenRequest:
+      description: 'The client_id and client_secret properties should only be sent in form data if the client does not support basic authentication for sending client credentials.'
+      properties:
+        grant_type:
+          type: string
+          enum:
+          - client_credentials
+          example: 'client_credentials'
+        scope:
+          description: 'A space separated list of scopes requested for the token'
+          type: string
+          example: 'member:read member:write'
+        client_id:
+          description: 'The ID provided when the client application was registered'
+          type: string
+          example: '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+        client_secret:
+          description: 'A secret code that would be setup for the client to exchange for an access token.'
+          type: string
+          example: 'fac663c0-e8b5-4c02-9ad3-ddbd1bbc6964'
+      required:
+      - grant_type
+      - scope
+    RefreshTokenRequest:
+      type: object
+      properties:
+        grant_type:
+          type: string
+          enum:
+          - refresh_token
+          example: 'refresh_token'
+        client_id:
+          description: 'The ID provided when the client application was registered'
+          type: string
+          example: '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+        refresh_token:
+          description: 'A long lived one time use token that is issued only in cases where the client can be offline or restarted and where the authorization should persist.'
+          type: string
+          minLength: 32
+          example: '2fbd6ad96acc4fa99ef36a3e803b010b'
+      required:
+      - grant_type
+      - client_id
+      - refresh_token
+`[1:]
+
+	loader := openapi3.NewLoader()
+
+	doc, err := loader.LoadFromData([]byte(spec))
+	require.NoError(t, err)
+
+	err = doc.Validate(loader.Context)
+	require.NoError(t, err)
+
+	router, err := gorillamux.NewRouter(doc)
+	require.NoError(t, err)
+
+	for _, testcase := range []struct {
+		ct, data string
+	}{
+		{
+			ct:   "application/json",
+			data: `{"grant_type":"client_credentials", "scope":"testscope", "client_id":"myclient", "client_secret":"mypass"}`,
+		},
+		{
+			ct:   "application/x-www-form-urlencoded",
+			data: "grant_type=client_credentials&scope=testscope&client_id=myclient&client_secret=mypass",
+		},
+	} {
+		t.Run(testcase.ct, func(t *testing.T) {
+			data := strings.NewReader(testcase.data)
+			req, err := http.NewRequest("POST", "/oauth2/token", data)
+			require.NoError(t, err)
+			req.Header.Add("Content-Type", testcase.ct)
+
+			route, pathParams, err := router.FindRoute(req)
+			require.NoError(t, err)
+
+			validationInput := &RequestValidationInput{
+				Request:    req,
+				PathParams: pathParams,
+				Route:      route,
+			}
+			err = ValidateRequest(loader.Context, validationInput)
+			require.NoError(t, err)
+		})
+	}
+}