diff --git a/manifests/ppa.pp b/manifests/ppa.pp
index 64c65bb..6b38e52 100644
--- a/manifests/ppa.pp
+++ b/manifests/ppa.pp
@@ -12,8 +12,9 @@ define apt::ppa(
     fail('lsbdistcodename fact not available: release parameter required')
   }
 
-  $filename_without_slashes = regsubst($name,'/','-','G')
-  $filename_without_ppa     = regsubst($filename_without_slashes, '^ppa:','','G')
+  $filename_without_slashes = regsubst($name, '/', '-', G)
+  $filename_without_dots    = regsubst($filename_without_slashes, '\.', '_', G)
+  $filename_without_ppa     = regsubst($filename_without_dots, '^ppa:', '', G)
   $sources_list_d_filename  = "${filename_without_ppa}-${release}.list"
 
   if ! defined(Package['python-software-properties']) {