diff --git a/benchs/bench_fw/descriptors.py b/benchs/bench_fw/descriptors.py
index 7af170e20c..f6164f54e2 100644
--- a/benchs/bench_fw/descriptors.py
+++ b/benchs/bench_fw/descriptors.py
@@ -214,6 +214,7 @@ class CodecDescriptor(IndexBaseDescriptor):
     factory: Optional[str] = None
     construction_params: Optional[List[Dict[str, int]]] = None
     training_vectors: Optional[DatasetDescriptor] = None
+    FILENAME_PREFIX: str = "xt"
 
     def __post_init__(self):
         self.get_name()
@@ -254,7 +255,7 @@ def name_from_factory(self) -> str:
         name += f"d_{self.d}.{self.metric.upper()}."
         if self.factory != "Flat":
             assert self.training_vectors is not None
-            name += self.training_vectors.get_filename("xt")
+            name += self.training_vectors.get_filename(CodecDescriptor.FILENAME_PREFIX)
         name += IndexBaseDescriptor.param_dict_list_to_name(self.construction_params)
         return name
 
@@ -278,6 +279,7 @@ def alias(self, benchmark_io: BenchmarkIO):
 class IndexDescriptor(IndexBaseDescriptor):
     codec_desc: Optional[CodecDescriptor] = None
     database_desc: Optional[DatasetDescriptor] = None
+    FILENAME_PREFIX: str = "xb"
 
     def __hash__(self):
         return hash(str(self))
@@ -290,14 +292,14 @@ def is_built(self):
 
     def get_name(self) -> str:
         if self.desc_name is None:
-            self.desc_name = self.codec_desc.get_name() + self.database_desc.get_filename(prefix="xb")
+            self.desc_name = self.codec_desc.get_name() + self.database_desc.get_filename(prefix=IndexDescriptor.FILENAME_PREFIX)
 
         return self.desc_name
 
     def flat_name(self):
         if self.flat_desc_name is not None:
             return self.flat_desc_name
-        self.flat_desc_name = self.codec_desc.flat_name() + self.database_desc.get_filename(prefix="xb")
+        self.flat_desc_name = self.codec_desc.flat_name() + self.database_desc.get_filename(prefix=IndexDescriptor.FILENAME_PREFIX)
         return self.flat_desc_name
 
     # alias is used to refer when index is uploaded to blobstore and refered again
@@ -313,6 +315,7 @@ class KnnDescriptor(IndexBaseDescriptor):
     query_dataset: Optional[DatasetDescriptor] = None
     search_params: Optional[Dict[str, int]] = None
     reconstruct: bool = False
+    FILENAME_PREFIX: str = "q"
     # range metric definitions
     # key: name
     # value: one of the following:
@@ -340,7 +343,7 @@ def __hash__(self):
     def get_name(self):
         name = self.index_desc.get_name()
         name += IndexBaseDescriptor.param_dict_to_name(self.search_params)
-        name += self.query_dataset.get_filename("q")
+        name += self.query_dataset.get_filename(KnnDescriptor.FILENAME_PREFIX)
         name += f"k_{self.k}."
         name += f"t_{self.num_threads}."
         if self.reconstruct:
@@ -353,7 +356,7 @@ def flat_name(self):
         if self.flat_desc_name is not None:
             return self.flat_desc_name
         name = self.index_desc.flat_name()
-        name += self.query_dataset.get_filename("q")
+        name += self.query_dataset.get_filename(KnnDescriptor.FILENAME_PREFIX)
         name += f"k_{self.k}."
         name += f"t_{self.num_threads}."
         if self.reconstruct: