diff --git a/class/LogicFunction.php b/class/LogicFunction.php
index c1ae9cf..e2750fc 100644
--- a/class/LogicFunction.php
+++ b/class/LogicFunction.php
@@ -243,7 +243,7 @@ class LogicFunction implements JsonSerializable
             if ($r == "1") {
                 $term = "(";
                 for ($j = 0; $j < $N; $j++) {
-                    $inv = (($i >> ($N - $j - 1)) & 1) ? "~" : "";
+                    $inv = (($i >> ($N - $j - 1)) & 1) ? "" : "~";
                     $term .= $inv . $this->input_vars[$j];
                     if ($j < ($N - 1)) {
                         $term .= " & ";