diff --git a/lib/dmllib.php b/lib/dmllib.php
index 7891246d4c9..d55c3612a16 100644
--- a/lib/dmllib.php
+++ b/lib/dmllib.php
@@ -2266,6 +2266,10 @@ function configure_dbconnection() {
         /// NOTE: Not 100% useful because GPC has been addslashed with the setting off
         ///       so IT'S MANDATORY TO ENABLE THIS UNDER php.ini or .htaccess for this DB
         ///       or to turn off magic_quotes to allow Moodle to do it properly
+        /// Now set the decimal separator to DOT, Moodle & PHP will always send floats to
+        /// DB using DOTS. Manually introduced floats (if using other characters) must be
+        /// converted back to DOTs (like gradebook does)
+            $db->Execute("ALTER SESSION SET NLS_NUMERIC_CHARACTERS='.,'");
             break;
     }
 }