diff --git a/src/apify_client/_http_clients/_base.py b/src/apify_client/_http_clients/_base.py
index 0af34169..e309c11e 100644
--- a/src/apify_client/_http_clients/_base.py
+++ b/src/apify_client/_http_clients/_base.py
@@ -153,7 +153,7 @@ def _parse_params(params: dict[str, Any] | None) -> dict[str, Any] | None:
         parsed_params: dict[str, Any] = {}
         for key, value in params.items():
             if isinstance(value, bool):
-                parsed_params[key] = int(value)
+                parsed_params[key] = (str(value)).lower()
             elif isinstance(value, list):
                 parsed_params[key] = ','.join(value)
             elif isinstance(value, datetime):