diff --git a/server/clip_server/model/model.py b/server/clip_server/model/model.py
index e4cfe3c3a..12de55e5b 100644
--- a/server/clip_server/model/model.py
+++ b/server/clip_server/model/model.py
@@ -464,7 +464,9 @@ def load_openai_model(
 
         # model from OpenAI state dict is in manually cast fp16 mode, must be converted for AMP/fp32/bf16 use
         model = model.to(device)
-        if dtype == torch.float32 or dtype.startswith('amp'):
+        if dtype == torch.float32 or (
+            isinstance(dtype, str) and dtype.startswith('amp')
+        ):
             model.float()
         elif dtype == torch.bfloat16:
             convert_weights_to_lp(model, dtype=torch.bfloat16)