diff --git a/params.go b/params.go
index f13d7b04fb..55aade42c1 100644
--- a/params.go
+++ b/params.go
@@ -189,10 +189,10 @@ type Params struct {
 	// Headers may be used to provide extra header lines on the HTTP request.
 	Headers http.Header `form:"-"`
 
-	IdempotencyKey *string           `form:"-"` // Passed as header
+	IdempotencyKey *string `form:"-"` // Passed as header
 
 	// Deprecated: Please use Metadata in the containing struct instead.
-	Metadata       map[string]string `form:"metadata"`
+	Metadata map[string]string `form:"metadata"`
 
 	// StripeAccount may contain the ID of a connected account. By including
 	// this field, the request is made as if it originated from the connected
diff --git a/stripe.go b/stripe.go
index 56c1da6533..d4c6dc27f2 100644
--- a/stripe.go
+++ b/stripe.go
@@ -293,7 +293,7 @@ func extractParams(params ParamsContainer) (*form.Values, *Params, error) {
 		if reflectValue.Kind() == reflect.Ptr && !reflectValue.IsNil() {
 			commonParams = params.GetParams()
 
-			if reflectValue.Elem().FieldByName("Metadata").IsZero() {
+			if !reflectValue.Elem().FieldByName("Metadata").IsZero() {
 				if commonParams.Metadata != nil {
 					return nil, nil, fmt.Errorf("You cannot specify both the (deprecated) .Params.Metadata and .Metadata in %s", reflectValue.Elem().Type().Name())
 				}