diff --git a/src/set-pages-config.js b/src/set-pages-config.js
index 612023d..bb5fc0c 100644
--- a/src/set-pages-config.js
+++ b/src/set-pages-config.js
@@ -83,7 +83,7 @@ function getConfigParserSettings({ staticSiteGenerator, generatorConfigFile, sit
         }
       }
     default:
-      throw `Unsupported static site generator: ${staticSiteGenerator}`
+      throw new Error(`Unsupported static site generator: ${staticSiteGenerator}`)
   }
 }