diff --git a/phpBB/language/en/install.php b/phpBB/language/en/install.php
index 5b8b38f4cc..50ec74f933 100644
--- a/phpBB/language/en/install.php
+++ b/phpBB/language/en/install.php
@@ -110,8 +110,6 @@ $lang = array_merge($lang, array(
 	'PHP_GETIMAGESIZE_SUPPORT_EXPLAIN'	=> 'In order for phpBB to function correctly, the getimagesize function needs to be available.',
 	'PCRE_UTF_SUPPORT'					=> 'PCRE UTF-8 support',
 	'PCRE_UTF_SUPPORT_EXPLAIN'			=> 'phpBB will not run if your PHP installation is not compiled with UTF-8 support in the PCRE extension.',
-	'PHP_JSON_SUPPORT'					=> 'PHP JSON support',
-	'PHP_JSON_SUPPORT_EXPLAIN'			=> 'In order for phpBB to function correctly, the PHP JSON extension needs to be available.',
 	'PHP_MBSTRING_SUPPORT'				=> 'PHP mbstring support',
 	'PHP_MBSTRING_SUPPORT_EXPLAIN'		=> 'In order for phpBB to function correctly, the PHP mbstring extension needs to be available.',
 	'PHP_XML_SUPPORT'					=> 'PHP XML/DOM support',
diff --git a/phpBB/phpbb/install/module/requirements/task/check_server_environment.php b/phpBB/phpbb/install/module/requirements/task/check_server_environment.php
index be48cf1967..bb43ed4b2f 100644
--- a/phpBB/phpbb/install/module/requirements/task/check_server_environment.php
+++ b/phpBB/phpbb/install/module/requirements/task/check_server_environment.php
@@ -68,9 +68,6 @@ class check_server_environment extends \phpbb\install\task_base
 		// Check for PCRE support
 		$this->check_pcre();
 
-		// Check for JSON support
-		$this->check_json();
-
 		// Check for mbstring support
 		$this->check_mbstring();
 
@@ -142,22 +139,6 @@ class check_server_environment extends \phpbb\install\task_base
 		$this->set_test_passed(false);
 	}
 
-	/**
-	 * Checks whether PHP's JSON extension is available or not
-	 */
-	protected function check_json()
-	{
-		if (@extension_loaded('json'))
-		{
-			$this->set_test_passed(true);
-			return;
-		}
-
-		$this->response_helper->add_error_message('PHP_JSON_SUPPORT', 'PHP_JSON_SUPPORT_EXPLAIN');
-
-		$this->set_test_passed(false);
-	}
-
 	/**
 	 * Checks whether PHP's mbstring extension is available or not
 	 */