diff --git a/DonationsStats.php b/DonationsStats.php
index ae04526..00da480 100755
--- a/DonationsStats.php
+++ b/DonationsStats.php
@@ -14,7 +14,9 @@ $total_ever = 0.0;
 
 function print_donation_year($year) {
 
-if ($db_link == false) {
+global $db_link;
+
+if ($db_link === false) {
     echo '<tr><td colspan="6">DB connection failed</td></tr>';
     return;
 }