diff --git a/openapi3filter/issue201_test.go b/openapi3filter/issue201_test.go
index 0d363a17e..7e2eaabe1 100644
--- a/openapi3filter/issue201_test.go
+++ b/openapi3filter/issue201_test.go
@@ -17,7 +17,7 @@ func TestIssue201(t *testing.T) {
 	loader := openapi3.NewLoader()
 	ctx := loader.Context
 	spec := `
-openapi: '3'
+openapi: '3.0.3'
 info:
   version: 1.0.0
   title: Sample API
@@ -37,20 +37,24 @@ paths:
               description: ''
               required: true
               schema:
+                type: string
                 pattern: '^blip$'
             x-blop:
               description: ''
               schema:
+                type: string
                 pattern: '^blop$'
             X-Blap:
               description: ''
               required: true
               schema:
+                type: string
                 pattern: '^blap$'
             X-Blup:
               description: ''
               required: true
               schema:
+                type: string
                 pattern: '^blup$'
 `[1:]
 
diff --git a/openapi3filter/validate_response.go b/openapi3filter/validate_response.go
index 1108031c9..4d09a2966 100644
--- a/openapi3filter/validate_response.go
+++ b/openapi3filter/validate_response.go
@@ -80,8 +80,7 @@ func ValidateResponse(ctx context.Context, input *ResponseValidationInput) error
 	sort.Strings(headers)
 	for _, headerName := range headers {
 		headerRef := response.Headers[headerName]
-		err := validateResponseHeader(headerName, headerRef, input, opts)
-		if err != nil {
+		if err := validateResponseHeader(headerName, headerRef, input, opts); err != nil {
 			return err
 		}
 	}
@@ -158,7 +157,7 @@ func ValidateResponse(ctx context.Context, input *ResponseValidationInput) error
 	return nil
 }
 
-func validateResponseHeader(headerName string, headerRef *openapi3.HeaderRef, input *ResponseValidationInput, opts []openapi3.SchemaValidationOption, ) error {
+func validateResponseHeader(headerName string, headerRef *openapi3.HeaderRef, input *ResponseValidationInput, opts []openapi3.SchemaValidationOption) error {
 	var err error
 	var decodedValue interface{}
 	var found bool
diff --git a/openapi3filter/validate_response_test.go b/openapi3filter/validate_response_test.go
index 71e1062b6..2d8039593 100644
--- a/openapi3filter/validate_response_test.go
+++ b/openapi3filter/validate_response_test.go
@@ -211,4 +211,4 @@ func newArraySchema(schema *openapi3.Schema) *openapi3.Schema {
 	arraySchema.Items = openapi3.NewSchemaRef("", schema)
 
 	return arraySchema
-}
\ No newline at end of file
+}