diff --git a/polyfill/lib/ecmascript.mjs b/polyfill/lib/ecmascript.mjs
index 7651ed97b1..0332b974f9 100644
--- a/polyfill/lib/ecmascript.mjs
+++ b/polyfill/lib/ecmascript.mjs
@@ -3764,8 +3764,7 @@ export function RejectDuration(y, mon, w, d, h, min, s, ms, µs, ns) {
 }
 
 function ISODateSurpasses(sign, y1, m1, d1, y2, m2, d2) {
-  const constrained = ConstrainISODate(y1, m1, d1);
-  const cmp = CompareISODate(constrained.year, constrained.month, constrained.day, y2, m2, d2);
+  const cmp = CompareISODate(y1, m1, d1, y2, m2, d2);
   return sign * cmp === 1;
 }
 
diff --git a/spec/plaindate.html b/spec/plaindate.html
index 7719237db3..d0f60b851d 100644
--- a/spec/plaindate.html
+++ b/spec/plaindate.html
@@ -799,8 +799,7 @@ <h1>
         </dd>
       </dl>
       <emu-alg>
-        1. Let _constrained_ be ! RegulateISODate(_y1_, _m1_, _d1_, *"constrain"*).
-        1. Let _comparison_ be CompareISODate(_constrained_.[[Year]], _constrained_.[[Month]], _constrained_.[[Day]], _y2_, _m2_, _d2_).
+        1. Let _comparison_ be CompareISODate(_y1_, _m1_, _d1_, _y2_, _m2_, _d2_).
         1. If _sign_ &times; _comparison_ is 1, return *true*.
         1. Return *false*.
       </emu-alg>