diff --git a/metomi/rosie/lib/html/template/rosie-disco/prefix-index.html b/metomi/rosie/lib/html/template/rosie-disco/prefix-index.html
index 357dd261b5..1cd9a7101f 100644
--- a/metomi/rosie/lib/html/template/rosie-disco/prefix-index.html
+++ b/metomi/rosie/lib/html/template/rosie-disco/prefix-index.html
@@ -225,7 +225,7 @@
{%- if "-list" in key %}
{%- set value = value|join(" ") %}
{%- endif %}
-{%- set info = info ~ "" ~ key ~ "" ~ ": " ~ value ~ "
" %}
+{%- set info = info ~ "" ~ key ~ "" ~ ": " ~ value|escape ~ "
" %}
{%- endif %}
{%- if loop.last %}