diff --git a/convert-hf-to-gguf.py b/convert-hf-to-gguf.py
index cdb1122ac..5955ef739 100755
--- a/convert-hf-to-gguf.py
+++ b/convert-hf-to-gguf.py
@@ -2311,7 +2311,8 @@ class MambaModel(Model):
                 data = data.astype(np.float32)
 
             # if f16 desired, convert big float32 2-dim weight tensors to float16
-            if self.ftype == 1 and data_dtype == np.float32 and new_name.removesuffix(".weight").endswith((".ssm_in", ".ssm_out", "token_embd", "output")) and n_dims == 2:
+            new_weight_name = new_name[:-len(".weight")] if new_name.endswith(".weight") else ""
+            if self.ftype == 1 and data_dtype == np.float32 and new_weight_name.endswith((".ssm_in", ".ssm_out", "token_embd", "output")) and n_dims == 2:
                 data = data.astype(np.float16)
 
             print(f"{new_name}, n_dims = {n_dims}, {old_dtype} --> {data.dtype}")
diff --git a/convert-persimmon-to-gguf.py b/convert-persimmon-to-gguf.py
index ccb99279e..69be17f94 100755
--- a/convert-persimmon-to-gguf.py
+++ b/convert-persimmon-to-gguf.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python3
+from __future__ import annotations
+
 import argparse
 import os
 import sys