diff --git a/lib/setup.php b/lib/setup.php
index 1c4bbf07cf6..f1d3054e4fd 100644
--- a/lib/setup.php
+++ b/lib/setup.php
@@ -216,6 +216,7 @@ if (!isset($_SERVER['REMOTE_ADDR']) && isset($_SERVER['argv'][0])) {
 
 // sometimes default PHP settings are borked on shared hosting servers, I wonder why they have to do that??
 ini_set('precision', 14); // needed for upgrades and gradebook
+ini_set('serialize_precision', 17); // Make float serialization consistent on all systems.
 
 // Scripts may request no debug and error messages in output
 // please note it must be defined before including the config.php script