diff --git a/app/models/host/discovered.rb b/app/models/host/discovered.rb
index 30d1ee2f..72382dba 100644
--- a/app/models/host/discovered.rb
+++ b/app/models/host/discovered.rb
@@ -222,7 +222,7 @@ def lookup_value_match
   end
 
   def self.normalize_string_for_hostname(hostname)
-    hostname = hostname.to_s.downcase.gsub(/(^[^a-z0-9]*|[^a-z0-9\-]|[^a-z0-9]*$)/,'')
+    hostname = hostname.to_s.downcase.gsub(/(^[^a-z0-9]*|[^a-z0-9-]|[^a-z0-9]*$)/,'')
     raise(::Foreman::Exception.new(N_("Invalid hostname: Could not normalize the hostname"))) unless hostname && hostname.present?
     hostname
   end