diff --git a/core/util.inc.php b/core/util.inc.php
index a44f932a..4b747190 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -161,6 +161,8 @@ function get_memory_limit() {
 		$memory = $default_limit; 
 	}
 
+	assert($memory > 0);
+
 	return $memory;
 }