diff --git a/litellm/llms/anthropic/count_tokens/handler.py b/litellm/llms/anthropic/count_tokens/handler.py
index e70e0f19b33..2e000f6c08d 100644
--- a/litellm/llms/anthropic/count_tokens/handler.py
+++ b/litellm/llms/anthropic/count_tokens/handler.py
@@ -67,7 +67,7 @@ class AnthropicCountTokensHandler(AnthropicCountTokensConfig):
             verbose_logger.debug(f"Transformed request: {request_body}")
 
             # Get endpoint URL
-            endpoint_url = api_base or self.get_anthropic_count_tokens_endpoint()
+            endpoint_url = f"{api_base}/v1/messages/count_tokens" if api_base else self.get_anthropic_count_tokens_endpoint()
 
             verbose_logger.debug(f"Making request to: {endpoint_url}")