diff --git a/ChangeLog b/ChangeLog
index 0875149686..9f26e7cb2f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -23,6 +23,7 @@ phpMyAdmin - ChangeLog
 + rfe #1582 SQL formatter
 
 4.3.8.0 (not yet released)
+- bug       Undefined constant PMA_DRIZZLE
 
 4.3.7.0 (2015-01-15)
 - bug #4694 js error on marking table as favorite in Safari (in private mode)
diff --git a/libraries/DatabaseInterface.class.php b/libraries/DatabaseInterface.class.php
index a2b9fd0944..a93f1d26b2 100644
--- a/libraries/DatabaseInterface.class.php
+++ b/libraries/DatabaseInterface.class.php
@@ -2391,6 +2391,10 @@ class PMA_DatabaseInterface
      */
     public function isSystemSchema($schema_name, $testForMysqlSchema = false)
     {
+        if (!defined("PMA_DRIZZLE")) {
+            define("PMA_DRIZZLE", false);
+        }
+
         return strtolower($schema_name) == 'information_schema'
             || (!PMA_DRIZZLE
                 && strtolower($schema_name) == 'performance_schema')