diff --git a/packages/babel-generator/src/printer.ts b/packages/babel-generator/src/printer.ts
index 7f5cbc2baed8..262c400bbc63 100644
--- a/packages/babel-generator/src/printer.ts
+++ b/packages/babel-generator/src/printer.ts
@@ -1039,7 +1039,8 @@ class Printer {
           } else if (
             type === COMMENT_TYPE.INNER &&
             !(node.type === "ObjectExpression" && node.properties.length > 1) &&
-            node.type !== "ClassBody"
+            node.type !== "ClassBody" &&
+            node.type !== "TSInterfaceBody"
           ) {
             // class X {
             //   /*:: a: number*/
diff --git a/packages/babel-generator/test/index.js b/packages/babel-generator/test/index.js
index a3004e38bc83..3e66ff8ad3e1 100644
--- a/packages/babel-generator/test/index.js
+++ b/packages/babel-generator/test/index.js
@@ -481,7 +481,7 @@ describe("generation", function () {
     ast.comments[0].loc = null;
     ast.comments[1].loc = undefined;
 
-    expect(generate(ast).code).toBe("/*#__PURE__*/ /*#__PURE__*/");
+    expect(generate(ast).code).toBe("/*#__PURE__*/\n/*#__PURE__*/");
   });
 
   it("leading comments without loc", () => {