diff --git a/includes/SpecialRandompage.php b/includes/SpecialRandompage.php
index 0cc945e5270..59836c9fedf 100644
--- a/includes/SpecialRandompage.php
+++ b/includes/SpecialRandompage.php
@@ -16,7 +16,7 @@ function wfSpecialRandompage( $par = NS_MAIN ) {
 
 	# Determine the namespace to get a random page from.
 	$namespace = $wgContLang->getNsIndex($par);
-	if (!$namespace || $namespace < NS_MAIN) {
+	if ($namespace === false || $namespace < NS_MAIN) {
 		$namespace = NS_MAIN;
 	}