diff --git a/mozdownload/scraper.py b/mozdownload/scraper.py
index a9ae5d2f..f73743b3 100755
--- a/mozdownload/scraper.py
+++ b/mozdownload/scraper.py
@@ -451,6 +451,8 @@ def get_latest_build_date(self):
                           months.entries[-1] + '/')
             parser = self._create_directory_parser(url)
             parser.entries = parser.filter(r'.*%s' % self.platform_regex)
+            if not parser.entries:
+                raise errors.NotSupportedError('Selected platform not available')
             parser.entries.sort()
 
             date = ''.join(parser.entries[-1].split('-')[:6])