diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 9002d977a..458575608 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -53,6 +53,8 @@ jobs:
         with:
           workspaces: ./rust
           key: v2
+          prefix-key: rust-${{ matrix.runs-on }}
+          save-if: ${{ github.ref == 'refs/heads/cloud' }}
 
       # TODO: Building *ring* from git requires us to install additional tools;
       # once we're not using a forked *ring* these 2 steps can be removed.