diff --git a/src/APIlite.php b/src/APIlite.php
index b6f320e..928ddf9 100644
--- a/src/APIlite.php
+++ b/src/APIlite.php
@@ -396,7 +396,12 @@ class APIlite
 						$param_value = (string) $param_value;
 						break;
 					case 'bool':
-						$param_value = (bool) $param_value;
+						if (is_string($param_value)) {
+							$param_value = strtolower($param_value);
+							$param_value = in_array($param_value, ['1', 'true', 'on', 'yes']);
+						} else {
+							$param_value = (bool) $param_value;
+						}
 						break;
 					case 'array':
 						$param_value = json_decode($param_value, true);