diff --git a/text_formatter.go b/text_formatter.go
index dd86caa..076de5d 100644
--- a/text_formatter.go
+++ b/text_formatter.go
@@ -54,7 +54,7 @@ type TextFormatter struct {
 
 func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 	var b *bytes.Buffer
-	var keys []string = make([]string, 0, len(entry.Data))
+	keys := make([]string, 0, len(entry.Data))
 	for k := range entry.Data {
 		keys = append(keys, k)
 	}