diff --git a/openapi3filter/issue436_test.go b/openapi3filter/issue436_test.go
new file mode 100644
index 000000000..fa106c5a1
--- /dev/null
+++ b/openapi3filter/issue436_test.go
@@ -0,0 +1,135 @@
+package openapi3filter_test
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"net/textproto"
+	"strings"
+
+	"github.com/getkin/kin-openapi/openapi3"
+	"github.com/getkin/kin-openapi/openapi3filter"
+	"github.com/getkin/kin-openapi/routers/gorillamux"
+)
+
+func Example_validateMultipartFormData() {
+	const spec = `
+openapi: 3.0.0
+info:
+  title: 'Validator'
+  version: 0.0.1
+paths:
+  /test:
+    post:
+      requestBody:
+        required: true
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              required:
+                - file
+              properties:
+                file:
+                  type: string
+                  format: binary
+                categories:
+                  type: array
+                  items:
+                    $ref: "#/components/schemas/Category"
+      responses:
+        '200':
+          description: Created
+
+components:
+  schemas:
+    Category:
+      type: object
+      properties:
+        name:
+          type: string
+      required:
+        - name
+`
+
+	loader := openapi3.NewLoader()
+	doc, err := loader.LoadFromData([]byte(spec))
+	if err != nil {
+		panic(err)
+	}
+	if err = doc.Validate(loader.Context); err != nil {
+		panic(err)
+	}
+
+	router, err := gorillamux.NewRouter(doc)
+	if err != nil {
+		panic(err)
+	}
+
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+
+	{ // Add a single "categories" item as part data
+		h := make(textproto.MIMEHeader)
+		h.Set("Content-Disposition", `form-data; name="categories"`)
+		h.Set("Content-Type", "application/json")
+		fw, err := writer.CreatePart(h)
+		if err != nil {
+			panic(err)
+		}
+		if _, err = io.Copy(fw, strings.NewReader(`{"name": "foo"}`)); err != nil {
+			panic(err)
+		}
+	}
+
+	{ // Add a single "categories" item as part data, again
+		h := make(textproto.MIMEHeader)
+		h.Set("Content-Disposition", `form-data; name="categories"`)
+		h.Set("Content-Type", "application/json")
+		fw, err := writer.CreatePart(h)
+		if err != nil {
+			panic(err)
+		}
+		if _, err = io.Copy(fw, strings.NewReader(`{"name": "bar"}`)); err != nil {
+			panic(err)
+		}
+	}
+
+	{ // Add file data
+		fw, err := writer.CreateFormFile("file", "hello.txt")
+		if err != nil {
+			panic(err)
+		}
+		if _, err = io.Copy(fw, strings.NewReader("hello")); err != nil {
+			panic(err)
+		}
+	}
+
+	writer.Close()
+
+	req, err := http.NewRequest(http.MethodPost, "/test", bytes.NewReader(body.Bytes()))
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+
+	route, pathParams, err := router.FindRoute(req)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = openapi3filter.ValidateRequestBody(
+		context.Background(),
+		&openapi3filter.RequestValidationInput{
+			Request:    req,
+			PathParams: pathParams,
+			Route:      route,
+		},
+		route.Operation.RequestBody.Value,
+	); err != nil {
+		panic(err)
+	}
+	// Output:
+}