diff --git a/model_server/base/api.py b/model_server/base/api.py
index 38705a2d8035be33cba4cef4d9283cd921c78302..d91ed5854350d1567fa68ae58c4f72f751063864 100644
--- a/model_server/base/api.py
+++ b/model_server/base/api.py
@@ -142,9 +142,9 @@ def read_accessor_from_file(filename: str, accessor_id: Union[str, None] = None)
 
 
 @app.put('/accessors/write_to_file/{accessor_id}')
-def write_accessor_to_file(accessor_id: str, filename: Union[str, None] = None) -> str:
+def write_accessor_to_file(accessor_id: str, filename: Union[str, None] = None, pop: bool = True) -> str:
     try:
-        return session.write_accessor(accessor_id, filename)
+        return session.write_accessor(accessor_id, filename, pop=pop)
     except AccessorIdError as e:
         raise HTTPException(404, f'Did not find accessor with ID {accessor_id}')
     except WriteAccessorError as e:
diff --git a/model_server/base/session.py b/model_server/base/session.py
index 1cef23b100b1d33873de00a2da3e6595027f63a8..12080c676816d009607d87a6250f79b7b7359c91 100644
--- a/model_server/base/session.py
+++ b/model_server/base/session.py
@@ -215,7 +215,7 @@ class _Session(object):
             self.del_accessor(acc_id)
         return acc
 
-    def write_accessor(self, acc_id: str, filename: Union[str, None] = None) -> str:
+    def write_accessor(self, acc_id: str, filename: Union[str, None] = None, pop=True) -> str:
         """
         Write an accessor to file and unload it from the session
         :param acc_id: accessor's ID
@@ -228,7 +228,7 @@ class _Session(object):
             fp = self.paths['outbound_images'] / filename
             if fp.exists():
                 raise InvalidPathError(f'Cannot overwrite file {filename} when writing accessor')
-        acc = self.get_accessor(acc_id, pop=True)
+        acc = self.get_accessor(acc_id, pop=pop)
 
         old_fp = self.accessors[acc_id]['filepath']
         if old_fp != '':