diff --git a/src/web/js/ide.js b/src/web/js/ide.js
index fe9bb612..857c170c 100644
--- a/src/web/js/ide.js
+++ b/src/web/js/ide.js
@@ -135,7 +135,7 @@ function makeRuntimeAPI(CPOIDEHooks) {
       // This function returns three string values, numerals to
       // appear before the decimal point, numerals to appear
       // after, and numerals to be repeated.
-      var decimal = jsnums.toRepeatingDecimal(num.numerator(), num.denominator(), runtime.NumberErrbacks);
+      var decimal = jsnums.toRepeatingDecimal(num.numerator(), num.denominator(), undefined, runtime.NumberErrbacks);
       return {
         type: 'number',
         value: {
diff --git a/src/web/js/output-ui.js b/src/web/js/output-ui.js
index bdad981b..b42b9734 100644
--- a/src/web/js/output-ui.js
+++ b/src/web/js/output-ui.js
@@ -1399,7 +1399,7 @@
           // after, and numerals to be repeated.
           var numr = num.numerator();
           var denr = num.denominator();
-          var decimal = jsnums.toRepeatingDecimal(numr, denr, runtime.NumberErrbacks);
+          var decimal = jsnums.toRepeatingDecimal(numr, denr, undefined, runtime.NumberErrbacks);
           var prePointString = decimal[0];
           var postPointString = decimal[1];
           var decRpt = decimal[2];