diff --git a/lib/renderTypeScript.js b/lib/renderTypeScript.js
index 4c7907e..0312cf2 100644
--- a/lib/renderTypeScript.js
+++ b/lib/renderTypeScript.js
@@ -109,7 +109,7 @@ function interfaceExtension(type) {
 // type - TopLevelType
 function interfaceOpen(type) {
   let str = '';
-  str += 'interface ';
+  str += 'export interface ';
   str += tse(type);
   str += interfaceExtension(type);
   str += ' {';