diff --git a/webapp/services/EventService.php b/webapp/services/EventService.php
index 833de2d3..f7fb6584 100644
--- a/webapp/services/EventService.php
+++ b/webapp/services/EventService.php
@@ -22,7 +22,7 @@ class EventService {
             $newFloatPart = $oldFloatPart + $floatPart;
             if ($newFloatPart > $maxFloatPart) {
                 ++$newIntPart;
-                $newFloatPart = min($maxFloatPart, $newFloatPart - $maxFloatPart);
+                $newFloatPart = min($maxFloatPart - 1, $newFloatPart - $maxFloatPart);
                 $newFloatPart = max($newFloatPart, 0);
             }