diff --git a/dangerfile.js b/dangerfile.js
index c5197705f..625f88777 100644
--- a/dangerfile.js
+++ b/dangerfile.js
@@ -121,6 +121,12 @@ const checkRepoSVN = game => {
   }
 }
 
+const checkRepoFTP = game => {
+  if (game.repo && game.repo.startsWith("ftp://")) {
+    warn(`🔗 ${game.name}'s repo is on a FTP server, which cannot be opened in some browsers by default. Please change it to the project's developer web page.`)
+  }
+}
+
 const checkRepoAdded = game => {
   if (!game.repo) return
   const match = game.repo.match(/github.com\/([^/]+)\//)
@@ -169,6 +175,7 @@ const commonChecks = game => {
   checkRepoGoogleCode(game)
   checkRepoGit(game)
   checkRepoSVN(game)
+  checkRepoFTP(game)
   checkLanguageKnown(game)
   checkFrameworkKnown(game)
   checkHasImagesOrVideos(game)