diff --git a/.gitignore b/.gitignore
index ffa36dee1..50070d789 100644
--- a/.gitignore
+++ b/.gitignore
@@ -221,3 +221,6 @@ csrc/moe/marlin_moe_wna16/kernel_*
 
 # Ignore ep_kernels_workspace folder
 ep_kernels_workspace/
+
+# Allow tracked library source folders under submodules (e.g., benchmarks/lib)
+!vllm/benchmarks/lib/