diff --git a/pmb/config/init.py b/pmb/config/init.py
index 43ee0a41..d6e10834 100644
--- a/pmb/config/init.py
+++ b/pmb/config/init.py
@@ -339,7 +339,7 @@ def frontend(args):
                  " or \"none\"")
     extra = pmb.helpers.cli.ask(args, "Extra packages", None,
                                 args.extra_packages,
-                                validation_regex="^([\w-]+)(,[\w-]+)*$")
+                                validation_regex="^([-.+\w]+)(,[-.+\w]+)*$")
     cfg["pmbootstrap"]["extra_packages"] = extra
 
     # Configure timezone info