diff --git a/spec/numberformat.html b/spec/numberformat.html
index 6fe71c76..46c24ec2 100644
--- a/spec/numberformat.html
+++ b/spec/numberformat.html
@@ -74,7 +74,7 @@ <h1>InitializeNumberFormat ( _numberFormat_, _locales_, _options_ )</h1>
           1. Let _mnfdDefault_ be _cDigits_.
         1. Else,
           1. Let _mnfdDefault_ be *0*.
-        1. Perform ! SetNumberFormatDigitOptions(_numberFormat_, _options_, _mnfdDefault_).
+        1. Perform ? SetNumberFormatDigitOptions(_numberFormat_, _options_, _mnfdDefault_).
         1. If _numberFormat_.[[maximumFractionDigits]] is *undefined*, then
           1. If _style_ is *"currency"*, then
             1. Set _numberFormat_.[[maximumFractionDigits]] to max(_numberFormat_.[[minimumFractionDigits]], _cDigits_).