diff --git a/tools/ete-toolkit/ete-treeviewer.xml b/tools/ete-toolkit/ete-treeviewer.xml
index a666c43c00f..22724285b60 100644
--- a/tools/ete-toolkit/ete-treeviewer.xml
+++ b/tools/ete-toolkit/ete-treeviewer.xml
@@ -18,6 +18,7 @@
         <requirement type="package" version="8.10.1">curl</requirement>
         <requirement type="package" version="1.6.1">xmlstarlet</requirement>
         <requirement type="package" version="7.1.1_41">imagemagick</requirement>
+        <requirement type="package" version="10.04.0">ghostscript</requirement>
     </requirements>
     <command detect_errors="exit_code"><![CDATA[