diff --git a/changelog/count.md b/changelog/count.md
new file mode 100644
index 000000000..36a3099e3
--- /dev/null
+++ b/changelog/count.md
@@ -0,0 +1 @@
+- Fixed that using `count()` would trigger a deprecation notice. [#813](https://github.com/smarty-php/smarty/issues/813)
\ No newline at end of file
diff --git a/libs/sysplugins/smarty_internal_templatecompilerbase.php b/libs/sysplugins/smarty_internal_templatecompilerbase.php
index 8ff3e0521..03797f7f8 100644
--- a/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -658,7 +658,7 @@ public function compilePHPFunctionCall($name, $parameter)
 					if (
 						!$this->smarty->loadPlugin('smarty_modifiercompiler_' . $name)
 						&& !isset($this->smarty->registered_plugins[Smarty::PLUGIN_MODIFIER][$name])
-						&& !in_array($name, ['time', 'join', 'is_array', 'in_array'])
+						&& !in_array($name, ['time', 'join', 'is_array', 'in_array', 'count'])
 					) {
 						trigger_error('Using unregistered function "' . $name . '" in a template is deprecated and will be ' .
 							'removed in a future release. Use Smarty::registerPlugin to explicitly register ' .
diff --git a/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php b/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
index 9a3f63191..2c0ee95c8 100644
--- a/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
+++ b/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
@@ -247,6 +247,7 @@ public function testDeprecationNoticesForSmarty5($strTemplateSource, $expected =
 		$this->smarty->assign('f', 3.14);
 
 		$errorMessage = '';
+		$output = '';
 
 		try {
 			$output = $this->smarty->fetch('string:' . $strTemplateSource);
@@ -282,6 +283,7 @@ public function dataDeprecationNoticesForSmarty5()
 			['{$a|substr:-1}', 'a', false],
 			['{$f|substr:-1}', '4', false],
 			['{$ar|count}', '2', false],
+			['{count($ar)}', '2', false],
 			['{foreach "."|explode:$f as $n}{$n}{/foreach}', '314', false],
 			['{"-"|implode:$ar}', '1-2', false],
 			['{"-"|join:$ar}', '1-2', false],