diff --git a/packages/babel-plugin-proposal-numeric-separator/src/index.js b/packages/babel-plugin-proposal-numeric-separator/src/index.js
index 915088dffe..9b16a62675 100644
--- a/packages/babel-plugin-proposal-numeric-separator/src/index.js
+++ b/packages/babel-plugin-proposal-numeric-separator/src/index.js
@@ -1,6 +1,19 @@
 import { declare } from "@babel/helper-plugin-utils";
 import syntaxNumericSeparator from "@babel/plugin-syntax-numeric-separator";
 
+/**
+ * Given a bigIntLiteral or NumericLiteral, remove numeric
+ * separator `_` from its raw representation
+ *
+ * @param {NodePath<BigIntLiteral | NumericLiteral>} { node }: A Babel AST node path
+ */
+function remover({ node }: NodePath<BigIntLiteral | NumericLiteral>) {
+  const { extra } = node;
+  if (extra && extra.raw.includes("_")) {
+    extra.raw = extra.raw.replace(/_/g, "");
+  }
+}
+
 export default declare(api => {
   api.assertVersion(7);
 
@@ -9,12 +22,8 @@ export default declare(api => {
     inherits: syntaxNumericSeparator,
 
     visitor: {
-      NumericLiteral({ node }) {
-        const { extra } = node;
-        if (extra && /_/.test(extra.raw)) {
-          extra.raw = extra.raw.replace(/_/g, "");
-        }
-      },
+      NumericLiteral: remover,
+      BigIntLiteral: remover,
     },
   };
 });
diff --git a/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint-exec/exec.js b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint-exec/exec.js
new file mode 100644
index 0000000000..829e285623
--- /dev/null
+++ b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint-exec/exec.js
@@ -0,0 +1 @@
+expect(9_007_199_254_740_993n).toBe(9007199254740993n);
diff --git a/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint-exec/options.json b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint-exec/options.json
new file mode 100644
index 0000000000..ec80ea0aff
--- /dev/null
+++ b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint-exec/options.json
@@ -0,0 +1,4 @@
+{
+  "plugins": ["proposal-numeric-separator"],
+  "minNodeVersion": "10.4.0"
+}
diff --git a/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint/input.js b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint/input.js
new file mode 100644
index 0000000000..b56a08a58a
--- /dev/null
+++ b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint/input.js
@@ -0,0 +1 @@
+9_007_199_254_740_993n;
diff --git a/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint/output.js b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint/output.js
new file mode 100644
index 0000000000..df6e6fd25d
--- /dev/null
+++ b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/bigint/output.js
@@ -0,0 +1 @@
+9007199254740993n;
diff --git a/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/exec.js b/packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/numeric/exec.js
similarity index 100%
rename from packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/exec.js
rename to packages/babel-plugin-proposal-numeric-separator/test/fixtures/removal/numeric/exec.js