diff --git a/vllm/entrypoints/cli/serve.py b/vllm/entrypoints/cli/serve.py
index 649bdb36f..195b945bc 100644
--- a/vllm/entrypoints/cli/serve.py
+++ b/vllm/entrypoints/cli/serve.py
@@ -108,6 +108,15 @@ class ServeSubcommand(CLISubcommand):
                         args.api_server_count,
                     )
 
+        # Elastic EP currently only supports running with at most one API server.
+        if getattr(args, "enable_elastic_ep", False) and args.api_server_count > 1:
+            logger.warning(
+                "Elastic EP only supports running with with at most one API server. "
+                "Capping api_server_count from %d to 1.",
+                args.api_server_count,
+            )
+            args.api_server_count = 1
+
         if args.api_server_count < 1:
             run_headless(args)
         elif args.api_server_count > 1: