diff --git a/phpBB/styles/prosilver/template/icons/iconify.html b/phpBB/styles/prosilver/template/icons/iconify.html
index 480313faca..436999069e 100644
--- a/phpBB/styles/prosilver/template/icons/iconify.html
+++ b/phpBB/styles/prosilver/template/icons/iconify.html
@@ -1,4 +1,4 @@
 {% spaceless %}
-	<i class="iconify o-icon{{ CLASSES ? ' ' ~ CLASSES }}"{% if S_HIDDEN %}{% if TITLE %} title="{{ lang(TITLE) }}"{% endif %} aria-hidden="true"{% endif %} data-icon="fa:{{ ICON }}" data-inline="true"{{ ATTRIBUTES }}></i>
+	<i class="iconify o-icon{{ CLASSES ? ' ' ~ CLASSES }}"{% if S_HIDDEN %}{% if TITLE %} title="{{ lang(TITLE) }}"{% endif %} aria-hidden="true"{% endif %} data-icon="{{ ICON }}" data-inline="true"{{ ATTRIBUTES }}></i>
 	{% if TITLE %}<span{% if S_HIDDEN %} class="sr-only"{% endif %}>{{ lang(TITLE) }}</span>{% endif %}
 {% endspaceless %}
diff --git a/tests/template/extension_test.php b/tests/template/extension_test.php
index a5af922c02..a9b2273372 100644
--- a/tests/template/extension_test.php
+++ b/tests/template/extension_test.php
@@ -306,7 +306,7 @@ class phpbb_template_extension_test extends phpbb_template_template_test_case
 			[
 				[
 					'type'			=> 'iconify',
-					'icon'			=> 'phone',
+					'icon'			=> 'fa:phone',
 					'title'			=> '',
 					'hidden'		=> false,
 					'classes'		=> '',
@@ -319,7 +319,7 @@ class phpbb_template_extension_test extends phpbb_template_template_test_case
 			[
 				[
 					'type'			=> 'iconify',
-					'icon'			=> 'pencil',
+					'icon'			=> 'mdi:pencil',
 					'title'			=> 'ICON_PENCIL',
 					'hidden'		=> true,
 					'classes'		=> 'icon-lg',
@@ -330,7 +330,7 @@ class phpbb_template_extension_test extends phpbb_template_template_test_case
 				[
 					'ICON_PENCIL'	=> 'Pencil icon',
 				],
-				'<i class="iconify o-icon icon-lg" title="Pencil icon" aria-hidden="true" data-icon="fa:phone" data-inline="true" data-swap="Swap text"></i>
+				'<i class="iconify o-icon icon-lg" title="Pencil icon" aria-hidden="true" data-icon="mdi:pencil" data-inline="true" data-swap="Swap text"></i>
 				<span class="sr-only">Pencil icon</span>',
 			],
 			/** PNG: default */