diff --git a/modern/src/maki-interpreter/tools/build-typescript-interfaces.js b/modern/src/maki-interpreter/tools/build-typescript-interfaces.js
index 9ff89f2e..7c2682c4 100644
--- a/modern/src/maki-interpreter/tools/build-typescript-interfaces.js
+++ b/modern/src/maki-interpreter/tools/build-typescript-interfaces.js
@@ -31,7 +31,7 @@ function mapType(makiType) {
       return "any";
   }
 
-  throw new Error(`Unhandled Maki type ${makiType}`);
+  throw new Error(`Unhandled Maki type "${makiType}"`);
 }
 
 function argumentTypeForParameter(param) {