diff --git a/interface/billing/billing_report.php b/interface/billing/billing_report.php
index bf436ae56ef..ee72b905c67 100644
--- a/interface/billing/billing_report.php
+++ b/interface/billing/billing_report.php
@@ -1125,7 +1125,7 @@ function criteriaSelectHasValue(select) {
                                         $lhtml .= "<option value=\"" . attr(substr($row['type'], 0, 1) . $row['provider']) . "\"";
                                         if (
                                             $key == $last_level_closed
-                                            || $insuranceCount = 1
+                                            || $insuranceCount == 1
                                         ) {
                                             $lhtml .= " selected";
                                             $default_x12_partner = $x12Partner;