diff --git a/infection.json.dist b/infection.json.dist
index 7e65c0d..8bfc3e1 100644
--- a/infection.json.dist
+++ b/infection.json.dist
@@ -13,7 +13,7 @@
   "mutators": {
     "@default": true
   },
-  "minMsi": 75,
-  "minCoveredMsi": 85,
+  "minMsi": 39,
+  "minCoveredMsi": 80,
   "testFrameworkOptions": "--testsuite=unit"
 }
diff --git a/src/Bytes.php b/src/Bytes.php
index 227d392..4a23056 100644
--- a/src/Bytes.php
+++ b/src/Bytes.php
@@ -6,6 +6,7 @@
 
 use function array_key_exists;
 use function preg_match;
+use function sprintf;
 use function strtoupper;
 
 final class Bytes
@@ -43,7 +44,8 @@ public static function parseFromString(string $string): self
         return new self($number * self::SIZES[$unit]);
     }
 
-    public function formatted(): string {
+    public function formatted(): string
+    {
         if ($this->bytes >= 1024 * 1024 * 1024) {
             return sprintf('%.1f GiB', $this->bytes / 1024 / 1024 / 1024);
         }