diff --git a/src/Contracts/InstanceIdentifier.php b/src/Contracts/InstanceIdentifier.php
index e99caeb..d2acbcf 100644
--- a/src/Contracts/InstanceIdentifier.php
+++ b/src/Contracts/InstanceIdentifier.php
@@ -18,5 +18,5 @@ interface InstanceIdentifier
      *
      * @return int|string
      */
-    public function getInstanceGlobalDiscount() : Money;
+    public function getInstanceGlobalDiscount(): Money;
 }