diff --git a/packages/babel-generator/src/generators/typescript.ts b/packages/babel-generator/src/generators/typescript.ts
index 14375b0beac5..f0284d824c9d 100644
--- a/packages/babel-generator/src/generators/typescript.ts
+++ b/packages/babel-generator/src/generators/typescript.ts
@@ -435,7 +435,7 @@ export function TSInterfaceDeclaration(
   this.space();
   this.print(id, node);
   this.print(typeParameters, node);
-  if (extendz) {
+  if (extendz?.length > 0) {
     this.space();
     this.word("extends");
     this.space();