diff --git a/.github/workflows/jsonrpc.yml b/.github/workflows/jsonrpc.yml
index 6db0a3670..4906d84b5 100644
--- a/.github/workflows/jsonrpc.yml
+++ b/.github/workflows/jsonrpc.yml
@@ -25,7 +25,9 @@ jobs:
         with:
           node-version: 18.x
       - name: Add Rust cache
-        uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4
+        uses: swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4
+        with:
+          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: npm install
         working-directory: deltachat-jsonrpc/typescript
         run: npm install