diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index 66317a7..ad4fab4 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -103,5 +103,34 @@
 
 
 	<config name="testVersion" value="5.2-99.0"/>
-	<rule ref="PHPCompatibility"/>
+	<rule ref="PHPCompatibility">
+		<!-- Whitelist PHP native classes, interfaces, functions and constants which
+			 are back-filled by WP.
+
+			 Based on:
+			 * /wp-includes/compat.php
+			 * /wp-includes/random_compat/random.php
+		-->
+		<exclude name="PHPCompatibility.PHP.NewClasses.errorFound"/>
+		<exclude name="PHPCompatibility.PHP.NewClasses.typeerrorFound"/>
+
+		<exclude name="PHPCompatibility.PHP.NewConstants.json_pretty_printFound"/>
+		<exclude name="PHPCompatibility.PHP.NewConstants.php_version_idFound"/>
+
+		<exclude name="PHPCompatibility.PHP.NewFunctions.hash_equalsFound"/>
+		<exclude name="PHPCompatibility.PHP.NewFunctions.json_last_error_msgFound"/>
+		<exclude name="PHPCompatibility.PHP.NewFunctions.random_intFound"/>
+		<exclude name="PHPCompatibility.PHP.NewFunctions.random_bytesFound"/>
+		<exclude name="PHPCompatibility.PHP.NewFunctions.array_replace_recursiveFound"/>
+
+		<exclude name="PHPCompatibility.PHP.NewInterfaces.jsonserializableFound"/>
+	</rule>
+
+	<!-- Whitelist the WP Core mysql_to_rfc3339() function. -->
+	<rule ref="PHPCompatibility.PHP.RemovedExtensions">
+		<properties>
+			<property name="functionWhitelist" type="array" value="mysql_to_rfc3339"/>
+		</properties>
+	</rule>
+
 </ruleset>