diff --git a/src/Services/AmountFormatter.php b/src/Services/AmountFormatter.php
index 3024a5a4..0265b3bd 100644
--- a/src/Services/AmountFormatter.php
+++ b/src/Services/AmountFormatter.php
@@ -58,7 +58,7 @@ class AmountFormatter
                     $unit = $options['measurement_unit'];
                     return $unit->isUseSIPrefix();
                 }
-                return true;
+                return false;
             },
             'is_integer' => function (Options $options) {
                 if ($options['measurement_unit'] !== null) {