diff --git a/lib/gitlab/regex.rb b/lib/gitlab/regex.rb
index 2c7b8af83f2..0002c7da8f1 100644
--- a/lib/gitlab/regex.rb
+++ b/lib/gitlab/regex.rb
@@ -37,7 +37,7 @@ module Gitlab
     end
 
     def environment_name_regex_chars
-      'a-zA-Z0-9_/\\$\\{\\}\\. -'
+      'a-zA-Z0-9_/\\$\\{\\}\\. \\-'
     end
 
     def environment_name_regex