diff --git a/phpBB/phpbb/template/twig/extension/icon.php b/phpBB/phpbb/template/twig/extension/icon.php
index be83222a62..3611f19042 100644
--- a/phpBB/phpbb/template/twig/extension/icon.php
+++ b/phpBB/phpbb/template/twig/extension/icon.php
@@ -48,7 +48,7 @@ class icon extends \Twig_Extension
 	public function getFunctions()
 	{
 		return [
-			new \Twig_SimpleFunction('icon', [$this, 'icon'], ['needs_environment' => true]),
+			new \Twig_SimpleFunction('Icon', [$this, 'icon'], ['needs_environment' => true]),
 		];
 	}
 
diff --git a/phpBB/styles/prosilver/template/index_body.html b/phpBB/styles/prosilver/template/index_body.html
index 3e37fb788e..38248328f0 100644
--- a/phpBB/styles/prosilver/template/index_body.html
+++ b/phpBB/styles/prosilver/template/index_body.html
@@ -37,30 +37,30 @@
 <div class="panel">
 	<h3>Font</h3>
 	<div>
-		{{ icon('font', 'bars', 'fa-fw icon-blue') }}
-		{{ icon('font', 'envelope-o') }}
-		{{ icon('font', 'pencil', '', '', true, {'data-ajax': 'true', 'data-refresh': 'true'}) }}
-		{{ icon('font', 'phone') }}
-		<a>{{ icon('font', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
-		<a class="button">{{ icon('font', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
+		{{ Icon('font', 'bars', 'fa-fw icon-blue') }}
+		{{ Icon('font', 'envelope-o') }}
+		{{ Icon('font', 'pencil', '', '', true, {'data-ajax': 'true', 'data-refresh': 'true'}) }}
+		{{ Icon('font', 'phone') }}
+		<a>{{ Icon('font', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
+		<a class="button">{{ Icon('font', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
 	</div>
 	<h3>PNG</h3>
 	<div>
-		{{ icon('png', 'bars') }}
-		{{ icon('png', 'envelope') }}
-		{{ icon('png', 'pencil') }}
-		{{ icon('png', 'phone') }}
-		<a>{{ icon('png', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
-		<a class="button">{{ icon('png', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
+		{{ Icon('png', 'bars') }}
+		{{ Icon('png', 'envelope') }}
+		{{ Icon('png', 'pencil') }}
+		{{ Icon('png', 'phone') }}
+		<a>{{ Icon('png', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
+		<a class="button">{{ Icon('png', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
 	</div>
 	<h3>SVG</h3>
 	<div>
-		{{ icon('svg', 'bars', 'fa-fw icon-blue') }}
-		{{ icon('svg', 'envelope', '', 'USERNAME', false) }}
-		{{ icon('svg', 'pencil') }}
-		{{ icon('svg', 'phone') }}
-		<a>{{ icon('svg', 'pencil') }}</a>
-		<a class="button">{{ icon('svg', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
+		{{ Icon('svg', 'bars', 'fa-fw icon-blue') }}
+		{{ Icon('svg', 'envelope', '', 'USERNAME', false) }}
+		{{ Icon('svg', 'pencil') }}
+		{{ Icon('svg', 'phone') }}
+		<a>{{ Icon('svg', 'pencil') }}</a>
+		<a class="button">{{ Icon('svg', 'pencil', 'fa-fw', 'POST_REPLY') }}</a>
 	</div>
 </div>