diff --git a/files/templates/comments.html b/files/templates/comments.html
index ded8f0cdb..b2ac05190 100644
--- a/files/templates/comments.html
+++ b/files/templates/comments.html
@@ -265,7 +265,7 @@
 							{% endif %}
 
 							<em class="ml-2 {% if not c.ping_cost %}d-none{% endif %}">
-								spent <span id="comment-ping-cost-{{c.id}}">{{c.ping_cost}}</span> currency on pings
+								spent <span id="comment-ping-cost-{{c.id}}">{{c.ping_cost|commas}}</span> currency on pings
 							</em>
 
 							{% if c.slots_result %}
diff --git a/files/templates/util/macros.html b/files/templates/util/macros.html
index 6c1c7c99c..f1ff6d8dd 100644
--- a/files/templates/util/macros.html
+++ b/files/templates/util/macros.html
@@ -136,7 +136,7 @@
 	<a class="vertical-align ml-2" href="{{p.permalink}}">#{{p.id}}</a>
 
 	{% if p.ping_cost %}
-		<em class="ml-2">spent {{p.ping_cost}} currency on pings</em>
+		<em class="ml-2">spent {{p.ping_cost|commas}} currency on pings</em>
 	{% endif %}
 {% endmacro %}