diff --git a/src/lib/Hydra/Helper/CatalystUtils.pm b/src/lib/Hydra/Helper/CatalystUtils.pm
index cb3840b0..07c593e3 100644
--- a/src/lib/Hydra/Helper/CatalystUtils.pm
+++ b/src/lib/Hydra/Helper/CatalystUtils.pm
@@ -214,7 +214,7 @@ sub paramToList {
 # Security checking of filenames.
 Readonly our $pathCompRE    => "(?:[A-Za-z0-9-\+\._\$][A-Za-z0-9-\+\._\$]*)";
 Readonly our $relPathRE     => "(?:$pathCompRE(?:/$pathCompRE)*)";
-Readonly our $relNameRE     => "(?:[A-Za-z0-9-][A-Za-z0-9-\.]*)";
+Readonly our $relNameRE     => "(?:[A-Za-z0-9-_][A-Za-z0-9-\._]*)";
 Readonly our $attrNameRE    => "(?:[A-Za-z_][A-Za-z0-9-_]*)";
 Readonly our $projectNameRE => "(?:[A-Za-z_][A-Za-z0-9-_]*)";
 Readonly our $jobsetNameRE  => "(?:[A-Za-z_][A-Za-z0-9-_]*)";