diff --git a/clients/python/lorax/types.py b/clients/python/lorax/types.py
index ad6dc3ab1..a34f0e612 100644
--- a/clients/python/lorax/types.py
+++ b/clients/python/lorax/types.py
@@ -22,15 +22,20 @@ class MergedAdapters(BaseModel):
     # Majority sign method
     majority_sign_method: Optional[str]
 
-    @validator("ids", "weights")
-    def validate_ids_weights(cls, ids, weights):
-        if not ids:
+    @validator("ids")
+    def validate_ids(cls, v):
+        if not v:
             raise ValidationError("`ids` cannot be empty")
-        if not weights:
+        return v
+
+    @validator("weights")
+    def validate_weights(cls, v, values):
+        ids = values["ids"]
+        if not v:
             raise ValidationError("`weights` cannot be empty")
-        if len(ids) != len(weights):
+        if len(ids) != len(v):
             raise ValidationError("`ids` and `weights` must have the same length")
-        return ids, weights
+        return v
     
     @validator("merge_strategy")
     def validate_merge_strategy(cls, v):
@@ -94,11 +99,12 @@ class Parameters(BaseModel):
     # Get decoder input token logprobs and ids
     decoder_input_details: bool = False
 
-    @validator("adapter_id", "merged_adapters")
-    def valid_adapter_id_merged_adapters(cls, adapter_id, merged_adapters):
-        if adapter_id is not None and merged_adapters is not None:
+    @validator("adapter_id")
+    def valid_adapter_id(cls, v, values):
+        merged_adapters = values.get("merged_adapters")
+        if v is not None and merged_adapters is not None:
             raise ValidationError("you must specify at most one of `adapter_id` or `merged_adapters`")
-        return adapter_id, merged_adapters
+        return v
 
     @validator("adapter_source")
     def valid_adapter_source(cls, v):