diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98dbac904116..0eff2f91ff4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## Changelog
 ##### Unreleased
+- Fixed replacement of substitutes of undefined capture groups in `.replace` in Safari 13.0-, [#471](https://github.com/zloirock/core-js/issues/471), [#745](https://github.com/zloirock/core-js/issues/745), thanks [@mattclough1](https://github.com/mattclough1)
 - Improved compat data for old engines
 
 ##### 3.6.2 - 2020.01.07
diff --git a/packages/core-js/internals/fix-regexp-well-known-symbol-logic.js b/packages/core-js/internals/fix-regexp-well-known-symbol-logic.js
index 932469f546ad..eb6e51d0b384 100644
--- a/packages/core-js/internals/fix-regexp-well-known-symbol-logic.js
+++ b/packages/core-js/internals/fix-regexp-well-known-symbol-logic.js
@@ -87,7 +87,7 @@ module.exports = function (KEY, length, exec, sham) {
     (KEY === 'replace' && !(
       REPLACE_SUPPORTS_NAMED_GROUPS &&
       REPLACE_KEEPS_$0 &&
-      REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
+      !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
     )) ||
     (KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC)
   ) {
diff --git a/packages/core-js/modules/es.string.replace.js b/packages/core-js/modules/es.string.replace.js
index f0e0933ced7f..b11e30652f9a 100644
--- a/packages/core-js/modules/es.string.replace.js
+++ b/packages/core-js/modules/es.string.replace.js
@@ -20,6 +20,10 @@ var maybeToString = function (it) {
 
 // @@replace logic
 fixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {
+  var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;
+  var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;
+  var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';
+
   return [
     // `String.prototype.replace` method
     // https://tc39.github.io/ecma262/#sec-string.prototype.replace
@@ -34,8 +38,8 @@ fixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, ma
     // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@replace
     function (regexp, replaceValue) {
       if (
-        !reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE &&
-        (reason.REPLACE_KEEPS_$0 || (typeof replaceValue === 'string' && replaceValue.indexOf('$0') === -1))
+        (!REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE && REPLACE_KEEPS_$0) ||
+        (typeof replaceValue === 'string' && replaceValue.indexOf(UNSAFE_SUBSTITUTE) === -1)
       ) {
         var res = maybeCallNative(nativeReplace, regexp, this, replaceValue);
         if (res.done) return res.value;
diff --git a/tests/compat/tests.js b/tests/compat/tests.js
index 4cf54aec10f9..3b30fae1ced4 100644
--- a/tests/compat/tests.js
+++ b/tests/compat/tests.js
@@ -875,7 +875,11 @@ GLOBAL.tests = {
       return result;
     };
 
-    return ''.replace(O) == 7 && execCalled && ''.replace(re2, '$<a>') === '7';
+    return ''.replace(O) == 7
+      && execCalled
+      && ''.replace(re2, '$<a>') === '7'
+      && 'a'.replace(/./, '$0') === '$0'
+      && /./[Symbol.replace]('a', '$0') === '$0';
   },
   'es.string.search': function () {
     var O = {};