diff --git a/thousands.go b/thousands.go
index 9727e37..1cd869d 100644
--- a/thousands.go
+++ b/thousands.go
@@ -7,7 +7,7 @@ import (
 )
 
 func Separate(Number interface{}, language ...string) (string, error) {
-
+	var key string
 	lang := map[string]string{"de": "German", "en": "English"}
 	useLang := lang[language[0]]
 
@@ -19,14 +19,15 @@ func Separate(Number interface{}, language ...string) (string, error) {
 	case int16:
 	case int32:
 	case int64:
+		key = "%d"
 	case float32:
 	case float64:
-
+		key = "%f"
 	default:
 		return "", fmt.Errorf("%T is no valid number format", n)
 	}
 
-	formattedNumber := p.Sprintf("%d", Number)
+	formattedNumber := p.Sprintf(key, Number)
 
 	return formattedNumber, nil
 }