diff --git a/modules/backend/widgets/Filter.php b/modules/backend/widgets/Filter.php
index 48153bf50..a3018a9bd 100644
--- a/modules/backend/widgets/Filter.php
+++ b/modules/backend/widgets/Filter.php
@@ -153,7 +153,7 @@ class Filter extends WidgetBase
                     $min = $scope->value[0];
                     $max = $scope->value[1];
 
-                    $params['minStr'] = $min ?? '∞';
+                    $params['minStr'] = $min ?? '-∞';
                     $params['min'] = $min ?? null;
 
                     $params['maxStr'] = $max ?? '∞';