diff --git a/packages/babel-parser/src/tokenizer/index.js b/packages/babel-parser/src/tokenizer/index.js
index 6d2c046457aa..3fdced8aaffd 100644
--- a/packages/babel-parser/src/tokenizer/index.js
+++ b/packages/babel-parser/src/tokenizer/index.js
@@ -1035,8 +1035,8 @@ export default class Tokenizer extends LocationParser {
       next = this.input.charCodeAt(this.state.pos);
     }
 
-    // disallow numeric separators in non octal decimals
-    if (this.hasPlugin("numericSeparator") && isNonOctalDecimalInt) {
+    // disallow numeric separators in non octal decimals and legacy octal likes
+    if (this.hasPlugin("numericSeparator") && (octal || isNonOctalDecimalInt)) {
       const underscorePos = this.input
         .slice(start, this.state.pos)
         .indexOf("_");
diff --git a/packages/babel-parser/test/fixtures/experimental/numeric-separator/invalid-legacy-octal-literal/input.js b/packages/babel-parser/test/fixtures/experimental/numeric-separator/invalid-legacy-octal-literal/input.js
new file mode 100644
index 000000000000..909c1baacf29
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/numeric-separator/invalid-legacy-octal-literal/input.js
@@ -0,0 +1 @@
+00_0
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/experimental/numeric-separator/invalid-legacy-octal-literal/options.json b/packages/babel-parser/test/fixtures/experimental/numeric-separator/invalid-legacy-octal-literal/options.json
new file mode 100644
index 000000000000..5a4fb4525d02
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/experimental/numeric-separator/invalid-legacy-octal-literal/options.json
@@ -0,0 +1 @@
+{ "throws": "Numeric separator can not be used after leading 0 (1:2)" }
diff --git a/scripts/tests/test262/test262_whitelist.txt b/scripts/tests/test262/test262_whitelist.txt
index 3eb50c7c2d4e..1082e285e660 100644
--- a/scripts/tests/test262/test262_whitelist.txt
+++ b/scripts/tests/test262/test262_whitelist.txt
@@ -104,12 +104,6 @@ language/expressions/object/method-definition/private-name-early-error-gen-insid
 language/expressions/object/method-definition/private-name-early-error-gen-inside-class.js(strict mode)
 language/expressions/object/method-definition/private-name-early-error-method-inside-class.js(default)
 language/expressions/object/method-definition/private-name-early-error-method-inside-class.js(strict mode)
-language/literals/numeric/numeric-separators/numeric-separator-literal-lol-00-err.js(default)
-language/literals/numeric/numeric-separators/numeric-separator-literal-lol-01-err.js(default)
-language/literals/numeric/numeric-separators/numeric-separator-literal-lol-07-err.js(default)
-language/literals/numeric/numeric-separators/numeric-separator-literal-lol-0_0-err.js(default)
-language/literals/numeric/numeric-separators/numeric-separator-literal-lol-0_1-err.js(default)
-language/literals/numeric/numeric-separators/numeric-separator-literal-lol-0_7-err.js(default)
 language/module-code/privatename-not-valid-earlyerr-module-1.js(default)
 language/module-code/privatename-not-valid-earlyerr-module-1.js(strict mode)
 language/module-code/privatename-not-valid-earlyerr-module-2.js(default)