diff --git a/openapi3filter/issue624_test.go b/openapi3filter/issue624_test.go
index d93682e52..1fdbdea34 100644
--- a/openapi3filter/issue624_test.go
+++ b/openapi3filter/issue624_test.go
@@ -48,17 +48,22 @@ paths:
 
 	router, err := gorillamux.NewRouter(doc)
 	require.NoError(t, err)
-	httpReq, err := http.NewRequest(http.MethodGet, `/items?test=test1`, nil)
-	require.NoError(t, err)
 
-	route, pathParams, err := router.FindRoute(httpReq)
-	require.NoError(t, err)
+	for _, testcase := range []string{`test1`, `test[1`} {
+		t.Run(testcase, func(t *testing.T) {
+			httpReq, err := http.NewRequest(http.MethodGet, `/items?test=`+testcase, nil)
+			require.NoError(t, err)
 
-	requestValidationInput := &RequestValidationInput{
-		Request:    httpReq,
-		PathParams: pathParams,
-		Route:      route,
+			route, pathParams, err := router.FindRoute(httpReq)
+			require.NoError(t, err)
+
+			requestValidationInput := &RequestValidationInput{
+				Request:    httpReq,
+				PathParams: pathParams,
+				Route:      route,
+			}
+			err = ValidateRequest(ctx, requestValidationInput)
+			require.NoError(t, err)
+		})
 	}
-	err = ValidateRequest(ctx, requestValidationInput)
-	require.NoError(t, err)
 }
diff --git a/openapi3filter/req_resp_decoder.go b/openapi3filter/req_resp_decoder.go
index 515d09cd1..dc83e5ac6 100644
--- a/openapi3filter/req_resp_decoder.go
+++ b/openapi3filter/req_resp_decoder.go
@@ -227,7 +227,7 @@ type valueDecoder interface {
 // decodeStyledParameter returns a value of an operation's parameter from HTTP request for
 // parameters defined using the style format, and whether the parameter is supplied in the input.
 // The function returns ParseError when HTTP request contains an invalid value of a parameter.
-func decodeStyledParameter(param *openapi3.Parameter, input *RequestValidationInput) (interface{}, bool, error) {
+func decodeStyledParameter(param *openapi3.Parameter, input *RequestValidationInput, schema *openapi3.SchemaRef) (interface{}, bool, error) {
 	sm, err := param.SerializationMethod()
 	if err != nil {
 		return nil, false, err
@@ -253,7 +253,7 @@ func decodeStyledParameter(param *openapi3.Parameter, input *RequestValidationIn
 		return nil, false, fmt.Errorf("unsupported parameter's 'in': %s", param.In)
 	}
 
-	return decodeValue(dec, param.Name, sm, param.Schema, param.Required)
+	return decodeValue(dec, param.Name, sm, schema, param.Required)
 }
 
 func decodeValue(dec valueDecoder, param string, sm *openapi3.SerializationMethod, schema *openapi3.SchemaRef, required bool) (interface{}, bool, error) {
diff --git a/openapi3filter/validate_request.go b/openapi3filter/validate_request.go
index b09987f74..b6db856a6 100644
--- a/openapi3filter/validate_request.go
+++ b/openapi3filter/validate_request.go
@@ -129,20 +129,29 @@ func ValidateParameter(ctx context.Context, input *RequestValidationInput, param
 	var value interface{}
 	var err error
 	var found bool
-	var schema *openapi3.Schema
+	var schemaRef *openapi3.SchemaRef
 
 	// Validation will ensure that we either have content or schema.
-	if parameter.Content != nil {
-		if value, schema, found, err = decodeContentParameter(parameter, input); err != nil {
-			return &RequestError{Input: input, Parameter: parameter, Err: err}
-		}
+	if parameter.Content == nil {
+		schemaRef = parameter.Schema
+	} else if len(parameter.Content) != 1 {
+		// We only know how to decode a parameter if it has one content, application/json
+		err = fmt.Errorf("multiple content types for parameter %q", parameter.Name)
+		return &RequestError{Input: input, Parameter: parameter, Err: err}
 	} else {
-		if value, found, err = decodeStyledParameter(parameter, input); err != nil {
+		mt := parameter.Content.Get("application/json")
+		if mt == nil {
+			err = fmt.Errorf("parameter %q has no content schema", parameter.Name)
 			return &RequestError{Input: input, Parameter: parameter, Err: err}
 		}
-		schema = parameter.Schema.Value
+		schemaRef = mt.Schema
+	}
+
+	if value, found, err = decodeStyledParameter(parameter, input, schemaRef); err != nil {
+		return &RequestError{Input: input, Parameter: parameter, Err: err}
 	}
 
+	schema := schemaRef.Value
 	// Set default value if needed
 	if value == nil && schema != nil && schema.Default != nil {
 		value = schema.Default
diff --git a/openapi3filter/validation_test.go b/openapi3filter/validation_test.go
index cd1fa8990..787d57e1f 100644
--- a/openapi3filter/validation_test.go
+++ b/openapi3filter/validation_test.go
@@ -328,7 +328,7 @@ func TestFilter(t *testing.T) {
 	// enough.
 	req = ExampleRequest{
 		Method: "POST",
-		URL:    "http://example.com/api/prefix/v/suffix?contentArg={\"name\":\"bob\", \"id\":\"a\"}",
+		URL:    `http://example.com/api/prefix/v/suffix?contentArg={"name":"bob", "id":"a"}`,
 	}
 	err = expect(req, resp)
 	require.NoError(t, err)
@@ -336,7 +336,7 @@ func TestFilter(t *testing.T) {
 	// Now it should fail due the ID being too long
 	req = ExampleRequest{
 		Method: "POST",
-		URL:    "http://example.com/api/prefix/v/suffix?contentArg={\"name\":\"bob\", \"id\":\"EXCEEDS_MAX_LENGTH\"}",
+		URL:    `http://example.com/api/prefix/v/suffix?contentArg={"name":"bob", "id":"EXCEEDS_MAX_LENGTH"}`,
 	}
 	err = expect(req, resp)
 	require.IsType(t, &RequestError{}, err)
@@ -351,7 +351,7 @@ func TestFilter(t *testing.T) {
 
 	req = ExampleRequest{
 		Method: "POST",
-		URL:    "http://example.com/api/prefix/v/suffix?contentArg2={\"name\":\"bob\", \"id\":\"a\"}",
+		URL:    `http://example.com/api/prefix/v/suffix?contentArg2={"name":"bob", "id":"a"}`,
 	}
 	err = expectWithDecoder(req, resp, customDecoder)
 	require.NoError(t, err)
@@ -359,7 +359,7 @@ func TestFilter(t *testing.T) {
 	// Now it should fail due the ID being too long
 	req = ExampleRequest{
 		Method: "POST",
-		URL:    "http://example.com/api/prefix/v/suffix?contentArg2={\"name\":\"bob\", \"id\":\"EXCEEDS_MAX_LENGTH\"}",
+		URL:    `http://example.com/api/prefix/v/suffix?contentArg2={"name":"bob", "id":"EXCEEDS_MAX_LENGTH"}`,
 	}
 	err = expectWithDecoder(req, resp, customDecoder)
 	require.IsType(t, &RequestError{}, err)