diff --git a/packages/babel-types/src/definitions/typescript.ts b/packages/babel-types/src/definitions/typescript.ts
index 7b4c34f44b..e8e3115722 100644
--- a/packages/babel-types/src/definitions/typescript.ts
+++ b/packages/babel-types/src/definitions/typescript.ts
@@ -566,7 +566,7 @@ defineType("TSTypeParameter", {
   visitor: ["constraint", "default"],
   fields: {
     name: {
-      validate: !process.env.BABEL_TYPES_8_BREAKING
+      validate: !process.env.BABEL_8_BREAKING
         ? assertValueType("string")
         : assertNodeType("Identifier"),
     },
diff --git a/packages/babel-types/test/builders/typescript/tsTypeParameter.js b/packages/babel-types/test/builders/typescript/tsTypeParameter.js
index 917faf5ada..d960dbabef 100644
--- a/packages/babel-types/test/builders/typescript/tsTypeParameter.js
+++ b/packages/babel-types/test/builders/typescript/tsTypeParameter.js
@@ -7,7 +7,7 @@ describe("builders", function () {
         const tsTypeParameter = t.tsTypeParameter(
           t.tsTypeReference(t.identifier("bar")),
           t.tsTypeReference(t.identifier("baz")),
-          !process.env.BABEL_TYPES_8_BREAKING ? "foo" : t.identifier("foo"),
+          !process.env.BABEL_8_BREAKING ? "foo" : t.identifier("foo"),
         );
         expect(tsTypeParameter).toMatchSnapshot({
           name: expect.anything(),
@@ -15,7 +15,7 @@ describe("builders", function () {
         // TODO(babel-8): move this check to the snapshot
         expect(tsTypeParameter).toEqual(
           expect.objectContaining({
-            name: !process.env.BABEL_TYPES_8_BREAKING
+            name: !process.env.BABEL_8_BREAKING
               ? "foo"
               : expect.objectContaining({
                   name: "foo",
@@ -31,7 +31,7 @@ describe("builders", function () {
             t.tsTypeReference(t.identifier("baz")),
           );
         }).toThrow(
-          !process.env.BABEL_TYPES_8_BREAKING
+          !process.env.BABEL_8_BREAKING
             ? "Property name expected type of string but got null"
             : 'Property name of TSTypeParameter expected node to be of a type ["Identifier"] but instead got undefined',
         );