diff --git a/.github/workflows/cpp-rllm.yml b/.github/workflows/cpp-rllm.yml
index cf34abc3..effc3a7b 100644
--- a/.github/workflows/cpp-rllm.yml
+++ b/.github/workflows/cpp-rllm.yml
@@ -16,6 +16,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+      with:
+        submodules: true
     - uses: Swatinem/rust-cache@v2
       with:
         cache-on-failure: true