diff --git a/internal/util/credentials.go b/internal/util/credentials.go
index ad8fa6d6e..b189c6c9d 100644
--- a/internal/util/credentials.go
+++ b/internal/util/credentials.go
@@ -54,7 +54,7 @@ func storeKey(key string) (string, error) {
 		}
 	}()
 
-	if _, err = tmpfile.Write([]byte(key)); err != nil {
+	if _, err = tmpfile.WriteString(key); err != nil {
 		return "", fmt.Errorf("error writing key to temporary keyfile: %w", err)
 	}