diff --git a/bioblend/galaxy/histories/__init__.py b/bioblend/galaxy/histories/__init__.py
index 750ed7c03..64e9d6ac4 100644
--- a/bioblend/galaxy/histories/__init__.py
+++ b/bioblend/galaxy/histories/__init__.py
@@ -160,7 +160,6 @@ def get_histories(
         keys: Optional[List[str]] = None,
         limit: Optional[int] = None,
         offset: Optional[int] = None,
-        all: Optional[bool] = False,
     ) -> List[Dict[str, Any]]:
         """
         Get all histories, or select a subset by specifying optional arguments